Standardize usage of virtual/override/final in chrome/browser/ui/

chrome/browser/ui/webui/gcm_internals_ui.cc

Index: chrome/browser/ui/webui/gcm_internals_ui.cc
diff --git a/chrome/browser/ui/webui/gcm_internals_ui.cc b/chrome/browser/ui/webui/gcm_internals_ui.cc
index 76f7cb2eedea223bf35507fa9b42ddebd6c64297..cec142e57359a5a8bdec6bc2745eb87cd82249f9 100644
--- a/chrome/browser/ui/webui/gcm_internals_ui.cc
+++ b/chrome/browser/ui/webui/gcm_internals_ui.cc
@@ -110,10 +110,10 @@ void SetSendingInfo(
 class GcmInternalsUIMessageHandler : public content::WebUIMessageHandler {
  public:
   GcmInternalsUIMessageHandler();
-  virtual ~GcmInternalsUIMessageHandler();
+  ~GcmInternalsUIMessageHandler() override;
 
   // WebUIMessageHandler implementation.
-  virtual void RegisterMessages() override;
+  void RegisterMessages() override;
 
  private:
   // Return all of the GCM related infos to the gcm-internals page by calling