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

chrome/browser/ui/webui/version_handler.h

Index: chrome/browser/ui/webui/version_handler.h
diff --git a/chrome/browser/ui/webui/version_handler.h b/chrome/browser/ui/webui/version_handler.h
index 276b5d685ec44bd0216b542947fb75bf08234db5..b7f272a90a82c352bc67ad90497b32035f6d2e3e 100644
--- a/chrome/browser/ui/webui/version_handler.h
+++ b/chrome/browser/ui/webui/version_handler.h
@@ -16,10 +16,10 @@
 class VersionHandler : public content::WebUIMessageHandler {
  public:
   VersionHandler();
-  virtual ~VersionHandler();
+  ~VersionHandler() override;
 
   // content::WebUIMessageHandler implementation.
-  virtual void RegisterMessages() override;
+  void RegisterMessages() override;
 
   // Callback for the "requestVersionInfo" message. This asynchronously requests
   // the flash version and eventually returns it to the front end along with the