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

chrome/browser/extensions/extension_action_icon_factory_unittest.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/extensions/extension_action_icon_factory.h"
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/json/json_file_value_serializer.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 127 matching lines @@
         extensions::ExtensionSystem::Get(profile_.get()))->
         CreateExtensionService(&command_line, base::FilePath(), false);
   }
 
   virtual void TearDown() override {
     profile_.reset();  // Get all DeleteSoon calls sent to ui_loop_.
     ui_loop_.RunUntilIdle();
   }
 
   // ExtensionActionIconFactory::Observer overrides:
-  virtual void OnIconUpdated() override {
+  void OnIconUpdated() override {
     if (quit_in_icon_updated_)
       base::MessageLoop::current()->Quit();
   }
 
   gfx::ImageSkia GetFavicon() {
     return *ui::ResourceBundle::GetSharedInstance().GetImageSkiaNamed(
         IDR_EXTENSIONS_FAVICON);
   }
 
   ExtensionAction* GetBrowserAction(const Extension& extension) {
@@ skipping 131 matching lines @@
   icon = icon_factory.GetIcon(1);
 
   EXPECT_TRUE(ImageRepsAreEqual(
       default_icon.ToImageSkia()->GetRepresentation(1.0f),
       icon.ToImageSkia()->GetRepresentation(1.0f)));
 
 }
 
 }  // namespace
 }  // namespace extensions