Code clean up.

Remove unused imports.
Remove unused fields.
Remove unnecessary cast.
Add missing override annotations.

Change-Id: Idad2e587697a5015eb5363d7b71fab9de9cc8ffb
diff --git a/src/com/android/gallery3d/ui/MenuExecutor.java b/src/com/android/gallery3d/ui/MenuExecutor.java
index 3619ca0..aaf5d39 100644
--- a/src/com/android/gallery3d/ui/MenuExecutor.java
+++ b/src/com/android/gallery3d/ui/MenuExecutor.java
@@ -380,6 +380,7 @@
             mListener = listener;
         }
 
+        @Override
         public Void run(JobContext jc) {
             int index = 0;
             DataManager manager = mActivity.getDataManager();