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

chrome/browser/ui/webui/nacl_ui.cc

Index: chrome/browser/ui/webui/nacl_ui.cc
diff --git a/chrome/browser/ui/webui/nacl_ui.cc b/chrome/browser/ui/webui/nacl_ui.cc
index 13a7a8ffd605fedf1b68fef3f6735bf567512f7d..b71ea775b4a92aa8efb40464352eadd1e6744ddf 100644
--- a/chrome/browser/ui/webui/nacl_ui.cc
+++ b/chrome/browser/ui/webui/nacl_ui.cc
@@ -72,10 +72,10 @@ content::WebUIDataSource* CreateNaClUIHTMLSource() {
 class NaClDomHandler : public WebUIMessageHandler {
  public:
   NaClDomHandler();
-  virtual ~NaClDomHandler();
+  ~NaClDomHandler() override;
 
   // WebUIMessageHandler implementation.
-  virtual void RegisterMessages() override;
+  void RegisterMessages() override;
 
  private:
   // Callback for the "requestNaClInfo" message.