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

chrome/browser/ui/webui/instant_ui.cc

Index: chrome/browser/ui/webui/instant_ui.cc
diff --git a/chrome/browser/ui/webui/instant_ui.cc b/chrome/browser/ui/webui/instant_ui.cc
index 2bc1be02a480b8f3676a5bbf5f5eee710740a528..ef8e5512842e6b60092b9de76abad309d9835356 100644
--- a/chrome/browser/ui/webui/instant_ui.cc
+++ b/chrome/browser/ui/webui/instant_ui.cc
@@ -51,10 +51,10 @@ class InstantUIMessageHandler
       public base::SupportsWeakPtr<InstantUIMessageHandler> {
  public:
   InstantUIMessageHandler();
-  virtual ~InstantUIMessageHandler();
+  ~InstantUIMessageHandler() override;
 
   // WebUIMessageHandler implementation.
-  virtual void RegisterMessages() override;
+  void RegisterMessages() override;
 
  private:
   void GetPreferenceValue(const base::ListValue* args);