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

ppapi/proxy/graphics_2d_resource.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_PROXY_GRAPHICS_2D_RESOURCE_H_
 #define PPAPI_PROXY_GRAPHICS_2D_RESOURCE_H_
 
 #include "base/compiler_specific.h"
 #include "ppapi/proxy/plugin_resource.h"
 #include "ppapi/proxy/ppapi_proxy_export.h"
 #include "ppapi/thunk/ppb_graphics_2d_api.h"
 
 namespace ppapi {
 
 class TrackedCallback;
 
 namespace proxy {
 
 class PPAPI_PROXY_EXPORT Graphics2DResource
       : public PluginResource,
         public NON_EXPORTED_BASE(thunk::PPB_Graphics2D_API) {
  public:
   Graphics2DResource(Connection connection,
                      PP_Instance instance,
                      const PP_Size& size,
                      PP_Bool is_always_opaque);
 
-  virtual ~Graphics2DResource();
+  ~Graphics2DResource() override;
 
   // Resource overrides.
-  virtual thunk::PPB_Graphics2D_API* AsPPB_Graphics2D_API() override;
+  thunk::PPB_Graphics2D_API* AsPPB_Graphics2D_API() override;
 
   // PPB_Graphics2D_API overrides.
-  virtual PP_Bool Describe(PP_Size* size, PP_Bool* is_always_opaque) override;
-  virtual void PaintImageData(PP_Resource image_data,
-                              const PP_Point* top_left,
-                              const PP_Rect* src_rect) override;
-  virtual void Scroll(const PP_Rect* clip_rect,
-                      const PP_Point* amount) override;
-  virtual void ReplaceContents(PP_Resource image_data) override;
-  virtual PP_Bool SetScale(float scale) override;
-  virtual float GetScale() override;
-  virtual int32_t Flush(scoped_refptr<TrackedCallback> callback) override;
-  virtual bool ReadImageData(PP_Resource image,
-                             const PP_Point* top_left) override;
+  PP_Bool Describe(PP_Size* size, PP_Bool* is_always_opaque) override;
+  void PaintImageData(PP_Resource image_data,
+                      const PP_Point* top_left,
+                      const PP_Rect* src_rect) override;
+  void Scroll(const PP_Rect* clip_rect, const PP_Point* amount) override;
+  void ReplaceContents(PP_Resource image_data) override;
+  PP_Bool SetScale(float scale) override;
+  float GetScale() override;
+  int32_t Flush(scoped_refptr<TrackedCallback> callback) override;
+  bool ReadImageData(PP_Resource image, const PP_Point* top_left) override;
 
  private:
   void OnPluginMsgFlushACK(const ResourceMessageReplyParams& params);
 
   const PP_Size size_;
   const PP_Bool is_always_opaque_;
   float scale_;
 
   scoped_refptr<TrackedCallback> current_flush_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(Graphics2DResource);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_GRAPHICS_2D_RESOURCE_H_