Fix some warnings in Eclipse

java/org/chromium/distiller/DomDistillerEntry.java

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.distiller;
 
 import com.google.gwt.core.client.EntryPoint;
 
 /**
  * Entry point classes define <code>onModuleLoad()</code>.
  */
 public class DomDistillerEntry implements EntryPoint {
   /**
    * This is the entry point method.
    */
+  @Override
   public void onModuleLoad() {
   }
 }