Remove normalizePathSeparators from com.facebook.buck.android.

Summary:
Removed all instances of normalizePathSeparators from classes in
com.facebook.buck.android src and test packages.

Test Plan:
Ran JUnit tests for AndroidResourceRuleTest, FilterResourcesStepTest,
and PrebuiltNativeLibraryRuleTest.  Ran ant clean test.
diff --git a/src/com/facebook/buck/android/AndroidBinaryRule.java b/src/com/facebook/buck/android/AndroidBinaryRule.java
index 052eafa..9291d75 100644
--- a/src/com/facebook/buck/android/AndroidBinaryRule.java
+++ b/src/com/facebook/buck/android/AndroidBinaryRule.java
@@ -60,7 +60,6 @@
 import com.facebook.buck.util.DirectoryTraverser;
 import com.facebook.buck.util.HumanReadableException;
 import com.facebook.buck.util.MorePaths;
-import com.facebook.buck.util.Paths;
 import com.facebook.buck.zip.RepackZipEntriesStep;
 import com.facebook.buck.zip.ZipDirectoryWithMaxDeflateStep;
 import com.google.common.annotations.VisibleForTesting;
@@ -718,11 +717,12 @@
    * @return path to directory (will not include trailing slash)
    */
   @VisibleForTesting
-  String getPathForProGuardDirectory() {
-    return String.format("%s/%s.proguard/%s",
+  Path getPathForProGuardDirectory() {
+    return MorePaths.newPathInstance(
+        String.format("%s/%s.proguard/%s",
         BuckConstant.GEN_DIR,
         getBuildTarget().getBasePathWithSlash(),
-        getBuildTarget().getShortName());
+        getBuildTarget().getShortName()));
   }
 
   @VisibleForTesting
@@ -790,15 +790,14 @@
   }
 
   @VisibleForTesting
-  String getProguardOutputFromInputClasspath(String classpathEntry) {
+  Path getProguardOutputFromInputClasspath(String classpathEntry) {
     // Hehe, this is so ridiculously fragile.
     Preconditions.checkArgument(classpathEntry.charAt(0) != '/',
         "Classpath entries should be relative rather than absolute paths: %s",
         classpathEntry);
     String obfuscatedName = Files.getNameWithoutExtension(classpathEntry) + "-obfuscated.jar";
-    String dirName = Paths.normalizePathSeparator(new File(classpathEntry).getParent());
-    String outputJar = getPathForProGuardDirectory() + "/" + dirName + "/" +
-        obfuscatedName;
+    Path dirName = MorePaths.newPathInstance(new File(classpathEntry).getParent());
+    Path outputJar = getPathForProGuardDirectory().resolve(dirName).resolve(obfuscatedName);
     return outputJar;
   }
 
@@ -824,7 +823,7 @@
     }
 
     // Clean out the directory for generated ProGuard files.
-    String proguardDirectory = getPathForProGuardDirectory();
+    Path proguardDirectory = getPathForProGuardDirectory();
     commands.add(new MakeCleanDirectoryStep(proguardDirectory));
 
     // Generate a file of ProGuard config options using aapt.
@@ -850,18 +849,19 @@
         .toMap(new Function<String, String>() {
           @Override
           public String apply(String classpathEntry) {
-            return getProguardOutputFromInputClasspath(classpathEntry);
+            return getProguardOutputFromInputClasspath(classpathEntry).toString();
           }
         });
 
     // Run ProGuard on the classpath entries.
+    // TODO: ProGuardObfuscateStep's final argument should be a Path
     ProGuardObfuscateStep obfuscateCommand = new ProGuardObfuscateStep(
         generatedProGuardConfig,
         proguardConfigsBuilder.build(),
         useAndroidProguardConfigWithOptimizations,
         inputOutputEntries,
         additionalLibraryJarsForProguardBuilder.build(),
-        proguardDirectory);
+        proguardDirectory.toString());
     commands.add(obfuscateCommand);
 
     // Apply the transformed inputs to the classpath (this will modify deps.classpathEntriesToDex
diff --git a/src/com/facebook/buck/android/FilterResourcesStep.java b/src/com/facebook/buck/android/FilterResourcesStep.java
index 181cde0..3568a85 100644
--- a/src/com/facebook/buck/android/FilterResourcesStep.java
+++ b/src/com/facebook/buck/android/FilterResourcesStep.java
@@ -24,7 +24,7 @@
 import com.facebook.buck.util.FilteredDirectoryCopier;
 import com.facebook.buck.util.Filters;
 import com.facebook.buck.util.HumanReadableException;
-import com.facebook.buck.util.Paths;
+import com.facebook.buck.util.MorePaths;
 import com.facebook.buck.util.ProjectFilesystem;
 import com.google.common.base.Preconditions;
 import com.google.common.base.Predicate;
@@ -234,7 +234,7 @@
           public void visit(File file, String relativePath) {
             if (DRAWABLE_PATH_PATTERN.matcher(relativePath).matches()) {
               // The path is normalized so that the value can be matched against patterns.
-              drawableBuilder.add(Paths.normalizePathSeparator(file.getPath()));
+              drawableBuilder.add(MorePaths.newPathInstance(file).toString());
             }
           }
         }.traverse();
diff --git a/test/com/facebook/buck/android/AndroidBinaryRuleTest.java b/test/com/facebook/buck/android/AndroidBinaryRuleTest.java
index 131c330..70ccdb7 100644
--- a/test/com/facebook/buck/android/AndroidBinaryRuleTest.java
+++ b/test/com/facebook/buck/android/AndroidBinaryRuleTest.java
@@ -485,11 +485,11 @@
         .setKeystore(addKeystoreRule(ruleResolver))
         .setTarget("Google Inc.:Google APIs:16"));
 
-    String proguardDir = rule.getProguardOutputFromInputClasspath(
+    Path proguardDir = rule.getProguardOutputFromInputClasspath(
         BIN_DIR + "/first-party/orca/lib-base/lib__lib-base__classes");
     assertEquals(GEN_DIR + "/.proguard/fbandroid_with_dash_debug_fbsign/" +
         BIN_DIR + "/first-party/orca/lib-base/lib__lib-base__classes-obfuscated.jar",
-        proguardDir);
+        proguardDir.toString());
   }
 
   private void assertCommandsInOrder(List<Step> steps, List<Class<?>> expectedCommands) {
diff --git a/test/com/facebook/buck/android/AndroidResourceRuleTest.java b/test/com/facebook/buck/android/AndroidResourceRuleTest.java
index b351e8f..7f4204e 100644
--- a/test/com/facebook/buck/android/AndroidResourceRuleTest.java
+++ b/test/com/facebook/buck/android/AndroidResourceRuleTest.java
@@ -32,7 +32,7 @@
 import com.facebook.buck.testutil.RuleMap;
 import com.facebook.buck.util.DirectoryTraversal;
 import com.facebook.buck.util.DirectoryTraverser;
-import com.facebook.buck.util.Paths;
+import com.facebook.buck.util.MorePaths;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableSortedSet;
 
@@ -51,7 +51,7 @@
     DirectoryTraverser traverser = new DirectoryTraverser() {
       @Override
       public void traverse(DirectoryTraversal traversal) throws IOException {
-        String rootPath = Paths.normalizePathSeparator(traversal.getRoot().getPath());
+        String rootPath = MorePaths.newPathInstance(traversal.getRoot()).toString();
         if ("java/src/com/facebook/base/res".equals(rootPath)) {
           traversal.visit(null, "drawable/E.xml");
           traversal.visit(null, "drawable/A.xml");
diff --git a/test/com/facebook/buck/android/FilterResourcesStepTest.java b/test/com/facebook/buck/android/FilterResourcesStepTest.java
index 737fee2..a9448a2 100644
--- a/test/com/facebook/buck/android/FilterResourcesStepTest.java
+++ b/test/com/facebook/buck/android/FilterResourcesStepTest.java
@@ -22,7 +22,7 @@
 import com.facebook.buck.step.ExecutionContext;
 import com.facebook.buck.util.FilteredDirectoryCopier;
 import com.facebook.buck.util.Filters;
-import com.facebook.buck.util.Paths;
+import com.facebook.buck.util.MorePaths;
 import com.facebook.buck.util.ProcessExecutor;
 import com.facebook.buck.util.ProjectFilesystem;
 import com.facebook.buck.util.Verbosity;
@@ -56,8 +56,8 @@
   private final String scaleDest = getFile(first, "mdpi", "other.png");
 
   private String getFile(String dir, String qualifier, String filename) {
-    return Paths.normalizePathSeparator(
-        new File(dir, String.format("drawable-%s/%s", qualifier, filename)).getPath());
+    return MorePaths.newPathInstance(
+        new File(dir, String.format("drawable-%s/%s", qualifier, filename))).toString();
   }
 
   @Test
diff --git a/test/com/facebook/buck/android/PrebuiltNativeLibraryRuleTest.java b/test/com/facebook/buck/android/PrebuiltNativeLibraryRuleTest.java
index bdf0bfd..541b2cf 100644
--- a/test/com/facebook/buck/android/PrebuiltNativeLibraryRuleTest.java
+++ b/test/com/facebook/buck/android/PrebuiltNativeLibraryRuleTest.java
@@ -22,7 +22,7 @@
 import com.facebook.buck.testutil.MoreAsserts;
 import com.facebook.buck.util.DirectoryTraversal;
 import com.facebook.buck.util.DirectoryTraverser;
-import com.facebook.buck.util.Paths;
+import com.facebook.buck.util.MorePaths;
 import com.google.common.collect.ImmutableList;
 
 import org.junit.Test;
@@ -40,7 +40,7 @@
     DirectoryTraverser traverser = new DirectoryTraverser() {
       @Override
       public void traverse(DirectoryTraversal traversal) throws IOException {
-        String rootPath = Paths.normalizePathSeparator(traversal.getRoot().getPath());
+        String rootPath = MorePaths.newPathInstance(traversal.getRoot()).toString();
         if ("java/src/com/facebook/base/libs".equals(rootPath)) {
           traversal.visit(null, "armeabi/foo.so");
           traversal.visit(null, "armeabi/libilbc-codec.so");