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

content/browser/android/browser_surface_texture_manager.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 CONTENT_BROWSER_ANDROID_BROWSER_SURFACE_TEXTURE_MANAGER_H_
 #define CONTENT_BROWSER_ANDROID_BROWSER_SURFACE_TEXTURE_MANAGER_H_
 
 #include "content/common/android/surface_texture_manager.h"
 
 #include "content/common/android/surface_texture_peer.h"
 
 namespace content {
 
 class BrowserSurfaceTextureManager : public SurfaceTextureManager,
                                      public SurfaceTexturePeer {
  public:
   BrowserSurfaceTextureManager();
-  virtual ~BrowserSurfaceTextureManager();
+  ~BrowserSurfaceTextureManager() override;
 
   // Overridden from SurfaceTextureManager:
-  virtual void RegisterSurfaceTexture(
-      int surface_texture_id,
-      int client_id,
-      gfx::SurfaceTexture* surface_texture) override;
-  virtual void UnregisterSurfaceTexture(int surface_texture_id,
-                                        int client_id) override;
-  virtual gfx::AcceleratedWidget AcquireNativeWidgetForSurfaceTexture(
+  void RegisterSurfaceTexture(int surface_texture_id,
+                              int client_id,
+                              gfx::SurfaceTexture* surface_texture) override;
+  void UnregisterSurfaceTexture(int surface_texture_id, int client_id) override;
+  gfx::AcceleratedWidget AcquireNativeWidgetForSurfaceTexture(
       int surface_texture_id) override;
 
   // Overridden from SurfaceTexturePeer:
-  virtual void EstablishSurfaceTexturePeer(
+  void EstablishSurfaceTexturePeer(
       base::ProcessHandle render_process_handle,
       scoped_refptr<gfx::SurfaceTexture> surface_texture,
       int render_frame_id,
       int player_id) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BrowserSurfaceTextureManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ANDROID_BROWSER_SURFACE_TEXTURE_MANAGER_H_