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

chrome/browser/speech/tts_win.cc

 // Copyright (c) 2012 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.
 
 #include <math.h>
 #include <sapi.h>
 
 #include "base/memory/singleton.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/values.h"
 #include "base/win/scoped_comptr.h"
 #include "chrome/browser/speech/tts_controller.h"
 #include "chrome/browser/speech/tts_platform.h"
 
 class TtsPlatformImplWin : public TtsPlatformImpl {
  public:
-  virtual bool PlatformImplAvailable() {
+  bool PlatformImplAvailable() override {
     return true;
   }
 
-  virtual bool Speak(
+  bool Speak(
       int utterance_id,
       const std::string& utterance,
       const std::string& lang,
       const VoiceData& voice,
-      const UtteranceContinuousParameters& params);
+      const UtteranceContinuousParameters& params) override;
 
-  virtual bool StopSpeaking();
+  bool StopSpeaking() override;
 
-  virtual void Pause();
+  void Pause() override;
 
-  virtual void Resume();
+  void Resume() override;
 
-  virtual bool IsSpeaking();
+  bool IsSpeaking() override;
 
-  virtual void GetVoices(std::vector<VoiceData>* out_voices) override;
+  void GetVoices(std::vector<VoiceData>* out_voices) override;
 
   // Get the single instance of this class.
   static TtsPlatformImplWin* GetInstance();
 
   static void __stdcall SpeechEventCallback(WPARAM w_param, LPARAM l_param);
 
  private:
   TtsPlatformImplWin();
-  virtual ~TtsPlatformImplWin() {}
+  ~TtsPlatformImplWin() override {}
 
   void OnSpeechEvent();
 
   base::win::ScopedComPtr<ISpVoice> speech_synthesizer_;
 
   // These apply to the current utterance only.
   std::wstring utterance_;
   int utterance_id_;
   int prefix_len_;
   ULONG stream_number_;
@@ skipping 191 matching lines @@
 TtsPlatformImplWin* TtsPlatformImplWin::GetInstance() {
   return Singleton<TtsPlatformImplWin,
                    LeakySingletonTraits<TtsPlatformImplWin> >::get();
 }
 
 // static
 void TtsPlatformImplWin::SpeechEventCallback(
     WPARAM w_param, LPARAM l_param) {
   GetInstance()->OnSpeechEvent();
 }