Remove unused method in DalvikAwareOutputStreamHelper.

Test Plan: Sandcastle builds.
diff --git a/src/com/facebook/buck/dalvik/DalvikAwareOutputStreamHelper.java b/src/com/facebook/buck/dalvik/DalvikAwareOutputStreamHelper.java
index e4c7aec..458efd3 100644
--- a/src/com/facebook/buck/dalvik/DalvikAwareOutputStreamHelper.java
+++ b/src/com/facebook/buck/dalvik/DalvikAwareOutputStreamHelper.java
@@ -111,21 +111,6 @@
     }
   }
 
-  private DalvikStatsTool.Stats getStats(FileLike entry) {
-    String name = entry.getRelativePath();
-    if (!name.endsWith(".class")) {
-      // Probably something like a pom.properties file in a JAR: this does not contribute
-      // to the linear alloc size, so return zero.
-      return DalvikStatsTool.Stats.ZERO;
-    }
-
-    try {
-      return DalvikStatsTool.getEstimate(entry.getInput());
-    } catch (IOException | RuntimeException e) {
-      throw new RuntimeException(String.format("Error calculating size for %s.", name), e);
-    }
-  }
-
   @Override
   public void close() throws IOException {
     outStream.close();