Standardize usage of virtual/override/final in chrome/browser/speech

chrome/browser/speech/tts_mac.mm

 // 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 <string>
 
 #include "base/mac/scoped_nsobject.h"
 #include "base/memory/singleton.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/values.h"
@@ skipping 32 matching lines @@
 }
 
 - (id)initWithUtterance:(NSString*)utterance;
 - (bool)startSpeakingRetainedUtterance;
 - (bool)startSpeakingString:(NSString*)utterance;
 
 @end
 
 class TtsPlatformImplMac : public TtsPlatformImpl {
  public:
-  virtual bool PlatformImplAvailable() override {
-    return true;
-  }
+  bool PlatformImplAvailable() override { return true; }
 
-  virtual bool Speak(
-      int utterance_id,
-      const std::string& utterance,
-      const std::string& lang,
-      const VoiceData& voice,
-      const UtteranceContinuousParameters& params) override;
+  bool Speak(int utterance_id,
+             const std::string& utterance,
+             const std::string& lang,
+             const VoiceData& voice,
+             const UtteranceContinuousParameters& params) override;
 
-  virtual bool StopSpeaking() override;
+  bool StopSpeaking() override;
 
-  virtual void Pause() override;
+  void Pause() override;
 
-  virtual void Resume() override;
+  void Resume() override;
 
-  virtual bool IsSpeaking() override;
+  bool IsSpeaking() override;
 
-  virtual void GetVoices(std::vector<VoiceData>* out_voices) override;
+  void GetVoices(std::vector<VoiceData>* out_voices) override;
 
   // Called by ChromeTtsDelegate when we get a callback from the
   // native speech engine.
   void OnSpeechEvent(NSSpeechSynthesizer* sender,
                      TtsEventType event_type,
                      int char_index,
                      const std::string& error_message);
 
   // Get the single instance of this class.
   static TtsPlatformImplMac* GetInstance();
 
  private:
   TtsPlatformImplMac();
-  virtual ~TtsPlatformImplMac();
+  ~TtsPlatformImplMac() override;
 
   base::scoped_nsobject<SingleUseSpeechSynthesizer> speech_synthesizer_;
   base::scoped_nsobject<ChromeTtsDelegate> delegate_;
   int utterance_id_;
   std::string utterance_;
   int last_char_index_;
   bool paused_;
 
   friend struct DefaultSingletonTraits<TtsPlatformImplMac>;
 
@@ skipping 247 matching lines @@
   didSpeak_ = true;
   return [super startSpeakingString:utterance_];
 }
 
 - (bool)startSpeakingString:(NSString*)utterance {
   CHECK(false);
   return false;
 }
 
 @end