Merge "Remove all pending messages when fragment destroyed" into main

src/com/android/settings/wifi/addappnetworks/AddAppNetworksFragment.java

@@ -207,7 +207,9 @@ public class AddAppNetworksFragment extends InstrumentedFragment implements
     @Override
     public void onDestroy() {
         mWorkerThread.quit();
-
+        if (mHandler.hasMessagesOrCallbacks()) {
+            mHandler.removeCallbacksAndMessages(null);
+        }
         super.onDestroy();
     }