Remove unused imports of JarFile

Change-Id: I7085fba92ca1a24d101484d2f0eee6b229f682e0
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/plugins/JsPlugin.java b/gerrit-server/src/main/java/com/google/gerrit/server/plugins/JsPlugin.java
index e21bb75..63f69b5 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/plugins/JsPlugin.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/plugins/JsPlugin.java
@@ -28,7 +28,6 @@
 import org.eclipse.jgit.internal.storage.file.FileSnapshot;
 
 import java.io.File;
-import java.util.jar.JarFile;
 
 class JsPlugin extends Plugin {
   private Injector httpInjector;
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/plugins/Plugin.java b/gerrit-server/src/main/java/com/google/gerrit/server/plugins/Plugin.java
index aeafc5be..ff6f0ae 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/plugins/Plugin.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/plugins/Plugin.java
@@ -29,7 +29,6 @@
 import java.util.Collections;
 import java.util.List;
 import java.util.jar.Attributes;
-import java.util.jar.JarFile;
 import java.util.jar.Manifest;
 
 public abstract class Plugin {