Make WebSpellCheckClient aware of leak detection

third_party/WebKit/public/web/WebSpellCheckClient.h

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 49 matching lines @@
                                       WebTextCheckingTypeMask mask,
                                       WebVector<WebTextCheckingResult>* results) { }
 
     // Requests asynchronous spelling and grammar checking, whose result should be
     // returned by passed completion object.
     virtual void requestCheckingOfText(const WebString& textToCheck,
                                        const WebVector<uint32_t>& markersInText,
                                        const WebVector<unsigned>& markerOffsets,
                                        WebTextCheckingCompletion* completionCallback) { }
 
+    // Clear all stored references to requests, so that it will not become a
+    // leak source.
+    virtual void cancelAllPendingRequests() { }
+
     // Show or hide the spelling UI.
     virtual void showSpellingUI(bool show) { }
 
     // Returns true if the spelling UI is showing.
     virtual bool isShowingSpellingUI() { return false; }
 
     // Update the spelling UI with the given word.
     virtual void updateSpellingUIWithMisspelledWord(const WebString& word) { }
 
 protected:
     ~WebSpellCheckClient() { }
 };
 
 } // namespace blink
 
 #endif