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

ppapi/proxy/flash_font_file_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_FONT_FILE_RESOURCE_H_
 #define PPAPI_PROXY_FLASH_FONT_FILE_RESOURCE_H_
 
 #include <map>
 #include <string>
 
@@ skipping 11 matching lines @@
 namespace proxy {
 
 // TODO(yzshen): write unittest and browser test.
 class FlashFontFileResource : public PluginResource,
                               public thunk::PPB_Flash_FontFile_API {
  public:
   FlashFontFileResource(Connection connection,
                         PP_Instance instance,
                         const PP_BrowserFont_Trusted_Description* description,
                         PP_PrivateFontCharset charset);
-  virtual ~FlashFontFileResource();
+  ~FlashFontFileResource() override;
 
   // Resource overrides.
-  virtual thunk::PPB_Flash_FontFile_API* AsPPB_Flash_FontFile_API() override;
+  thunk::PPB_Flash_FontFile_API* AsPPB_Flash_FontFile_API() override;
 
   // PPB_Flash_FontFile_API.
-  virtual PP_Bool GetFontTable(uint32_t table,
-                               void* output,
-                               uint32_t* output_length) override;
+  PP_Bool GetFontTable(uint32_t table,
+                       void* output,
+                       uint32_t* output_length) override;
 
  private:
   // Sees if we have a cache of the font table and returns a pointer to it.
   // Returns NULL if we don't have it.
   std::string* GetFontTable(uint32_t table) const;
 
   std::string* AddFontTable(uint32_t table, const std::string& contents);
 
   typedef std::map<uint32_t, linked_ptr<std::string> > FontTableMap;
   FontTableMap font_tables_;
 
   SerializedFontDescription description_;
   PP_PrivateFontCharset charset_;
 
   DISALLOW_COPY_AND_ASSIGN(FlashFontFileResource);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_FLASH_FONT_FILE_RESOURCE_H_