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

chrome/browser/ui/cocoa/location_bar/search_button_decoration.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_COCOA_LOCATION_BAR_SEARCH_BUTTON_DECORATION_H_
 #define CHROME_BROWSER_UI_COCOA_LOCATION_BAR_SEARCH_BUTTON_DECORATION_H_
 
 #import <Cocoa/Cocoa.h>
 
 #include "chrome/browser/ui/cocoa/location_bar/button_decoration.h"
 
 class LocationBarViewMac;
 
 // |SearchButtonDecoration| adds a search/go button to the right of the omnibox.
 
 class SearchButtonDecoration : public ButtonDecoration {
  public:
   explicit SearchButtonDecoration(LocationBarViewMac* owner);
-  virtual ~SearchButtonDecoration();
+  ~SearchButtonDecoration() override;
 
   // Implement |LocationBarDecoration|.
-  virtual CGFloat GetWidthForSpace(CGFloat width) override;
-  virtual void DrawInFrame(NSRect frame, NSView* control_view) override;
-  virtual bool OnMousePressed(NSRect frame, NSPoint location) override;
+  CGFloat GetWidthForSpace(CGFloat width) override;
+  void DrawInFrame(NSRect frame, NSView* control_view) override;
+  bool OnMousePressed(NSRect frame, NSPoint location) override;
 
  private:
   // The control view that owns this. Weak.
   LocationBarViewMac* owner_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchButtonDecoration);
 };
 
 #endif  // CHROME_BROWSER_UI_COCOA_LOCATION_BAR_SEARCH_BUTTON_DECORATION_H_