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

ppapi/proxy/flash_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_FLASH_RESOURCE_H_
 #define PPAPI_PROXY_FLASH_RESOURCE_H_
 
 #include "ppapi/c/pp_instance.h"
 #include "ppapi/c/pp_var.h"
 #include "ppapi/c/private/ppb_flash.h"
 #include "ppapi/proxy/connection.h"
 #include "ppapi/proxy/plugin_resource.h"
 #include "ppapi/thunk/ppb_flash_functions_api.h"
 
 namespace ppapi {
 namespace proxy {
 
 class PluginDispatcher;
 
 class FlashResource
     : public PluginResource,
       public thunk::PPB_Flash_Functions_API {
  public:
   FlashResource(Connection connection,
                 PP_Instance instance,
                 PluginDispatcher* plugin_dispatcher);
-  virtual ~FlashResource();
+  ~FlashResource() override;
 
   // Resource override.
-  virtual thunk::PPB_Flash_Functions_API* AsPPB_Flash_Functions_API() override;
+  thunk::PPB_Flash_Functions_API* AsPPB_Flash_Functions_API() override;
 
   // PPB_Flash_Functions_API implementation.
-  virtual PP_Var GetProxyForURL(PP_Instance instance,
-                                const std::string& url) override;
-  virtual void UpdateActivity(PP_Instance instance) override;
-  virtual PP_Bool SetCrashData(PP_Instance instance,
-                               PP_FlashCrashKey key,
-                               PP_Var value) override;
-  virtual double GetLocalTimeZoneOffset(PP_Instance instance,
-                                        PP_Time t) override;
-  virtual PP_Var GetSetting(PP_Instance instance,
-                            PP_FlashSetting setting) override;
-  virtual void SetInstanceAlwaysOnTop(PP_Instance instance,
-                                      PP_Bool on_top) override;
-  virtual PP_Bool DrawGlyphs(
+  PP_Var GetProxyForURL(PP_Instance instance, const std::string& url) override;
+  void UpdateActivity(PP_Instance instance) override;
+  PP_Bool SetCrashData(PP_Instance instance,
+                       PP_FlashCrashKey key,
+                       PP_Var value) override;
+  double GetLocalTimeZoneOffset(PP_Instance instance, PP_Time t) override;
+  PP_Var GetSetting(PP_Instance instance, PP_FlashSetting setting) override;
+  void SetInstanceAlwaysOnTop(PP_Instance instance, PP_Bool on_top) override;
+  PP_Bool DrawGlyphs(
       PP_Instance instance,
       PP_Resource pp_image_data,
       const PP_BrowserFont_Trusted_Description* font_desc,
       uint32_t color,
       const PP_Point* position,
       const PP_Rect* clip,
       const float transformation[3][3],
       PP_Bool allow_subpixel_aa,
       uint32_t glyph_count,
       const uint16_t glyph_indices[],
       const PP_Point glyph_advances[]) override;
-  virtual int32_t Navigate(PP_Instance instance,
-                           PP_Resource request_info,
-                           const char* target,
-                           PP_Bool from_user_action) override;
-  virtual PP_Bool IsRectTopmost(PP_Instance instance,
-                                const PP_Rect* rect) override;
-  virtual void InvokePrinting(PP_Instance instance) override;
+  int32_t Navigate(PP_Instance instance,
+                   PP_Resource request_info,
+                   const char* target,
+                   PP_Bool from_user_action) override;
+  PP_Bool IsRectTopmost(PP_Instance instance, const PP_Rect* rect) override;
+  void InvokePrinting(PP_Instance instance) override;
 
  private:
   // Non-owning pointer to the PluginDispatcher that owns this object.
   PluginDispatcher* plugin_dispatcher_;
 
   DISALLOW_COPY_AND_ASSIGN(FlashResource);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_FLASH_RESOURCE_H_