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

chromeos/audio/cras_audio_handler.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 CHROMEOS_AUDIO_CRAS_AUDIO_HANDLER_H_
 #define CHROMEOS_AUDIO_CRAS_AUDIO_HANDLER_H_
 
 #include <queue>
 
 #include "base/basictypes.h"
@@ skipping 173 matching lines @@
   // and right channel back to the normal mode.
   // If the feature is not supported on the device, nothing happens.
   virtual void SwapInternalSpeakerLeftRightChannel(bool swap);
 
   // Enables error logging.
   virtual void LogErrors();
 
  protected:
   explicit CrasAudioHandler(
       scoped_refptr<AudioDevicesPrefHandler> audio_pref_handler);
-  virtual ~CrasAudioHandler();
+  ~CrasAudioHandler() override;
 
  private:
   friend class CrasAudioHandlerTest;
 
   // CrasAudioClient::Observer overrides.
-  virtual void AudioClientRestarted() override;
-  virtual void NodesChanged() override;
-  virtual void ActiveOutputNodeChanged(uint64 node_id) override;
-  virtual void ActiveInputNodeChanged(uint64 node_id) override;
+  void AudioClientRestarted() override;
+  void NodesChanged() override;
+  void ActiveOutputNodeChanged(uint64 node_id) override;
+  void ActiveInputNodeChanged(uint64 node_id) override;
 
   // AudioPrefObserver overrides.
-  virtual void OnAudioPolicyPrefChanged() override;
+  void OnAudioPolicyPrefChanged() override;
 
   // SessionManagerClient::Observer overrides.
-  virtual void EmitLoginPromptVisibleCalled() override;
+  void EmitLoginPromptVisibleCalled() override;
 
   // Sets the active audio output/input node to the node with |node_id|.
   // If |notify|, notifies Active*NodeChange.
   void SetActiveOutputNode(uint64 node_id, bool notify);
   void SetActiveInputNode(uint64 node_id, bool notify);
 
   // Sets up the audio device state based on audio policy and audio settings
   // saved in prefs.
   void SetupAudioInputState();
   void SetupAudioOutputState();
@@ skipping 100 matching lines @@
   bool log_errors_;
 
   base::WeakPtrFactory<CrasAudioHandler> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CrasAudioHandler);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_AUDIO_CRAS_AUDIO_HANDLER_H_