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

ppapi/proxy/flash_resource.h

Index: ppapi/proxy/flash_resource.h
diff --git a/ppapi/proxy/flash_resource.h b/ppapi/proxy/flash_resource.h
index 891de4c1a875c45bfb24d0a67f0fb96276441a0e..21cdbb73bce4b96eff759e3c19d493deade2625a 100644
--- a/ppapi/proxy/flash_resource.h
+++ b/ppapi/proxy/flash_resource.h
@@ -24,25 +24,21 @@ class FlashResource
   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,
@@ -54,13 +50,12 @@ class FlashResource
       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.