Update {virtual,override} to follow C++11 style in chrome.

chrome/renderer/tts_dispatcher.h

 // Copyright (c) 2013 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.
 
 #ifndef CHROME_RENDERER_TTS_DISPATCHER_H_
 #define CHROME_RENDERER_TTS_DISPATCHER_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 16 matching lines @@
 // itself when deleted. There can be multiple TtsDispatchers alive at once,
 // so each one routes IPC messages to its WebSpeechSynthesizerClient only if
 // the utterance id (which is globally unique) matches.
 class TtsDispatcher
     : public blink::WebSpeechSynthesizer,
       public content::RenderProcessObserver {
  public:
   explicit TtsDispatcher(blink::WebSpeechSynthesizerClient* client);
 
  private:
-  virtual ~TtsDispatcher();
+  ~TtsDispatcher() override;
 
   // RenderProcessObserver override.
   bool OnControlMessageReceived(const IPC::Message& message) override;
 
   // blink::WebSpeechSynthesizer implementation.
-  virtual void updateVoiceList() override;
-  virtual void speak(const blink::WebSpeechSynthesisUtterance& utterance)
-      override;
-  virtual void pause() override;
-  virtual void resume() override;
-  virtual void cancel() override;
+  void updateVoiceList() override;
+  void speak(const blink::WebSpeechSynthesisUtterance& utterance) override;
+  void pause() override;
+  void resume() override;
+  void cancel() override;
 
   blink::WebSpeechSynthesisUtterance FindUtterance(int utterance_id);
 
   void OnSetVoiceList(const std::vector<TtsVoice>& voices);
   void OnDidStartSpeaking(int utterance_id);
   void OnDidFinishSpeaking(int utterance_id);
   void OnDidPauseSpeaking(int utterance_id);
   void OnDidResumeSpeaking(int utterance_id);
   void OnWordBoundary(int utterance_id, int char_index);
   void OnSentenceBoundary(int utterance_id, int char_index);
@@ skipping 10 matching lines @@
   // Next utterance id, used to map response IPCs to utterance objects.
   static int next_utterance_id_;
 
   // Map from id to utterance objects.
   base::hash_map<int, blink::WebSpeechSynthesisUtterance> utterance_id_map_;
 
   DISALLOW_COPY_AND_ASSIGN(TtsDispatcher);
 };
 
 #endif  // CHROME_RENDERER_TTS_DISPATCHER_H_