Standardize usage of virtual/override/final specifiers.

chrome/browser/ui/views/infobars/extension_infobar.cc

 // Copyright (c) 2012 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.
 
 #include "chrome/browser/ui/views/infobars/extension_infobar.h"
 
 #include "chrome/browser/extensions/extension_context_menu_model.h"
 #include "chrome/browser/extensions/extension_infobar_delegate.h"
 #include "chrome/browser/extensions/extension_view_host.h"
 #include "chrome/browser/platform_util.h"
@@ skipping 34 matching lines @@
 const int kIconHorizontalMargin = 1;
 
 class MenuImageSource: public gfx::CanvasImageSource {
  public:
   MenuImageSource(const gfx::ImageSkia& icon, const gfx::ImageSkia& drop_image)
       : gfx::CanvasImageSource(ComputeSize(drop_image), false),
         icon_(icon),
         drop_image_(drop_image) {
   }
 
-  virtual ~MenuImageSource() {
-  }
+  ~MenuImageSource() override {}
 
   // Overridden from gfx::CanvasImageSource
-  virtual void Draw(gfx::Canvas* canvas) override {
+  void Draw(gfx::Canvas* canvas) override {
     int image_size = extension_misc::EXTENSION_ICON_BITTY;
     canvas->DrawImageInt(icon_, 0, 0, icon_.width(), icon_.height(), 0, 0,
                          image_size, image_size, false);
     canvas->DrawImageInt(drop_image_, image_size + kDropArrowLeftMargin,
                          image_size / 2);
   }
 
  private:
   gfx::Size ComputeSize(const gfx::ImageSkia& drop_image) const {
     int image_size = extension_misc::EXTENSION_ICON_BITTY;
@@ skipping 157 matching lines @@
 }
 
 ExtensionViewViews* ExtensionInfoBar::GetExtensionView() {
   return static_cast<ExtensionViewViews*>(
       GetDelegate()->extension_view_host()->view());
 }
 
 int ExtensionInfoBar::NonExtensionViewWidth() const {
   return infobar_icon_->width() + kIconHorizontalMargin;
 }