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

ppapi/shared_impl/ppb_audio_config_shared.h

 // 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.
 
 #ifndef PPAPI_SHARED_IMPL_PPB_AUDIO_CONFIG_SHARED_H_
 #define PPAPI_SHARED_IMPL_PPB_AUDIO_CONFIG_SHARED_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ppapi/shared_impl/resource.h"
 #include "ppapi/thunk/ppb_audio_config_api.h"
 
 namespace ppapi {
 
 const int kBitsPerAudioInputSample = 16;
 const int kAudioInputChannels = 1;
 
 // TODO(dalecurtis, yzshen): PPAPI shouldn't hard code these values for all
 // clients.
 const int kBitsPerAudioOutputSample = 16;
 const int kAudioOutputChannels = 2;
 
 class PPAPI_SHARED_EXPORT PPB_AudioConfig_Shared
     : public Resource,
       public thunk::PPB_AudioConfig_API {
  public:
-  virtual ~PPB_AudioConfig_Shared();
+  ~PPB_AudioConfig_Shared() override;
 
   static PP_Resource Create(ResourceObjectType type,
                             PP_Instance instance,
                             PP_AudioSampleRate sample_rate,
                             uint32_t sample_frame_count);
   static uint32_t RecommendSampleFrameCount_1_0(
       PP_AudioSampleRate sample_rate,
       uint32_t request_sample_frame_count);
   static uint32_t RecommendSampleFrameCount_1_1(
       PP_Instance instance,
       PP_AudioSampleRate sample_rate,
       uint32_t request_sample_frame_count);
   static PP_AudioSampleRate RecommendSampleRate(PP_Instance);
 
   // Resource overrides.
-  virtual thunk::PPB_AudioConfig_API* AsPPB_AudioConfig_API() override;
+  thunk::PPB_AudioConfig_API* AsPPB_AudioConfig_API() override;
 
   // PPB_AudioConfig_API implementation.
-  virtual PP_AudioSampleRate GetSampleRate() override;
-  virtual uint32_t GetSampleFrameCount() override;
+  PP_AudioSampleRate GetSampleRate() override;
+  uint32_t GetSampleFrameCount() override;
 
  private:
   // You must call Init before using this object.
   PPB_AudioConfig_Shared(ResourceObjectType type, PP_Instance instance);
 
   // Returns false if the arguments are invalid, the object should not be
   // used in this case.
   bool Init(PP_AudioSampleRate sample_rate, uint32_t sample_frame_count);
 
   PP_AudioSampleRate sample_rate_;
   uint32_t sample_frame_count_;
 
   DISALLOW_COPY_AND_ASSIGN(PPB_AudioConfig_Shared);
 };
 
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_PPB_AUDIO_CONFIG_SHARED_H_