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

ppapi/proxy/media_stream_video_track_resource.h

 // Copyright 2014 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_PROXY_MEDIA_STREAM_VIDEO_TRACK_RESOURCE_H_
 #define PPAPI_PROXY_MEDIA_STREAM_VIDEO_TRACK_RESOURCE_H_
 
 #include <map>
 
 #include "base/memory/ref_counted.h"
@@ skipping 10 matching lines @@
     : public MediaStreamTrackResourceBase,
       public thunk::PPB_MediaStreamVideoTrack_API {
  public:
   MediaStreamVideoTrackResource(Connection connection,
                                 PP_Instance instance,
                                 int pending_renderer_id,
                                 const std::string& id);
 
   MediaStreamVideoTrackResource(Connection connection, PP_Instance instance);
 
-  virtual ~MediaStreamVideoTrackResource();
+  ~MediaStreamVideoTrackResource() override;
 
   // Resource overrides:
-  virtual thunk::PPB_MediaStreamVideoTrack_API*
-  AsPPB_MediaStreamVideoTrack_API() override;
+  thunk::PPB_MediaStreamVideoTrack_API* AsPPB_MediaStreamVideoTrack_API()
+      override;
 
   // PPB_MediaStreamVideoTrack_API overrides:
-  virtual PP_Var GetId() override;
-  virtual PP_Bool HasEnded() override;
-  virtual int32_t Configure(const int32_t attrib_list[],
-                            scoped_refptr<TrackedCallback> callback) override;
-  virtual int32_t GetAttrib(PP_MediaStreamVideoTrack_Attrib attrib,
-                            int32_t* value) override;
-  virtual int32_t GetFrame(PP_Resource* frame,
-                           scoped_refptr<TrackedCallback> callback) override;
-  virtual int32_t RecycleFrame(PP_Resource frame) override;
-  virtual void Close() override;
-  virtual int32_t GetEmptyFrame(
-      PP_Resource* frame, scoped_refptr<TrackedCallback> callback) override;
-  virtual int32_t PutFrame(PP_Resource frame) override;
+  PP_Var GetId() override;
+  PP_Bool HasEnded() override;
+  int32_t Configure(const int32_t attrib_list[],
+                    scoped_refptr<TrackedCallback> callback) override;
+  int32_t GetAttrib(PP_MediaStreamVideoTrack_Attrib attrib,
+                    int32_t* value) override;
+  int32_t GetFrame(PP_Resource* frame,
+                   scoped_refptr<TrackedCallback> callback) override;
+  int32_t RecycleFrame(PP_Resource frame) override;
+  void Close() override;
+  int32_t GetEmptyFrame(PP_Resource* frame,
+                        scoped_refptr<TrackedCallback> callback) override;
+  int32_t PutFrame(PP_Resource frame) override;
 
   // MediaStreamBufferManager::Delegate overrides:
-  virtual void OnNewBufferEnqueued() override;
+  void OnNewBufferEnqueued() override;
 
  private:
   PP_Resource GetVideoFrame();
 
   void ReleaseFrames();
 
   // IPC message handlers.
   void OnPluginMsgConfigureReply(const ResourceMessageReplyParams& params,
                                  const std::string& track_id);
 
   // Allocated frame resources by |GetFrame()|.
   typedef std::map<PP_Resource, scoped_refptr<VideoFrameResource> > FrameMap;
   FrameMap frames_;
 
   PP_Resource* get_frame_output_;
   scoped_refptr<TrackedCallback> get_frame_callback_;
 
   scoped_refptr<TrackedCallback> configure_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamVideoTrackResource);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_MEDIA_STREAM_VIDEO_TRACK_RESOURCE_H_