Fix warnings and remove dead code

Change-Id: I574d823fedf4b752c3df5a72599b390f708823ac

src/com/android/launcher2/IconCache.java

@@ -33,6 +33,7 @@ import java.util.HashMap;
  * Cache of application icons.  Icons can be made from any thread.
  */
 public class IconCache {
+    @SuppressWarnings("unused")
     private static final String TAG = "Launcher.IconCache";
 
     private static final int INITIAL_ICON_CACHE_CAPACITY = 50;