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

chrome/browser/ui/cocoa/tab_contents/sad_tab_controller.h

Index: chrome/browser/ui/cocoa/tab_contents/sad_tab_controller.h
diff --git a/chrome/browser/ui/cocoa/tab_contents/sad_tab_controller.h b/chrome/browser/ui/cocoa/tab_contents/sad_tab_controller.h
index ef01d2ba452be5883e093e4d69bb66f26b08d427..ad3e923e3c65771536fc8140780b7bd4107781a2 100644
--- a/chrome/browser/ui/cocoa/tab_contents/sad_tab_controller.h
+++ b/chrome/browser/ui/cocoa/tab_contents/sad_tab_controller.h
@@ -20,12 +20,12 @@ class SadTabCocoa : public SadTab {
  public:
   explicit SadTabCocoa(content::WebContents* web_contents);
 
-  virtual ~SadTabCocoa();
+  ~SadTabCocoa() override;
 
  private:
   // Overridden from SadTab:
-  virtual void Show() override;
-  virtual void Close() override;
+  void Show() override;
+  void Close() override;
 
   base::scoped_nsobject<SadTabController> sad_tab_controller_;