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

chrome/utility/font_cache_handler_win.h

Index: chrome/utility/font_cache_handler_win.h
diff --git a/chrome/utility/font_cache_handler_win.h b/chrome/utility/font_cache_handler_win.h
index e92ef4a530a502183466a2f596c2453ce96574b5..2e2fb40e8c4eee6e5a38ea365380f08b23622356 100644
--- a/chrome/utility/font_cache_handler_win.h
+++ b/chrome/utility/font_cache_handler_win.h
@@ -24,10 +24,10 @@ class Thread;
 class FontCacheHandler : public UtilityMessageHandler {
  public:
   FontCacheHandler() {}
-  virtual ~FontCacheHandler() {}
+  ~FontCacheHandler() override {}
 
   // IPC::Listener implementation
-  virtual bool OnMessageReceived(const IPC::Message& message) override;
+  bool OnMessageReceived(const IPC::Message& message) override;
 
  private:
   void OnBuildFontCache(const base::FilePath& full_path);