Fix some warnings in Eclipse

java/org/chromium/distiller/labels/LabelAction.java

 // Copyright 2015 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.
 
 /**
  * boilerpipe
  *
  * Copyright (c) 2009, 2010 Christian Kohlschütter
  *
  * The author licenses this file to You under the Apache License, Version 2.0
@@ skipping 32 matching lines @@
     }
 
     protected final void addLabelsTo(final TextBlock tb) {
         tb.addLabels(labels);
     }
 
     public String[] getLabels() {
         return labels;
     }
 
+    @Override
     public String toString() {
         return super.toString()+"{"+Arrays.asList(labels)+"}";
     }
 }