Standardize usage of virtual/override/final specifiers.

ui/message_center/message_center_tray_unittest.cc

 // Copyright (c) 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.
 
 #include "ui/message_center/message_center_tray.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/models/menu_model.h"
 #include "ui/message_center/message_center.h"
@@ skipping 28 matching lines @@
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MockDelegate);
 };
 
 }  // namespace
 
 class MessageCenterTrayTest : public testing::Test {
  public:
   MessageCenterTrayTest() {}
-  virtual ~MessageCenterTrayTest() {}
+  ~MessageCenterTrayTest() override {}
 
-  virtual void SetUp() {
+  void SetUp() override {
     MessageCenter::Initialize();
     delegate_.reset(new MockDelegate);
     message_center_ = MessageCenter::Get();
     message_center_tray_.reset(
         new MessageCenterTray(delegate_.get(), message_center_));
   }
 
-  virtual void TearDown() {
+  void TearDown() override {
     message_center_tray_.reset();
     delegate_.reset();
     message_center_ = NULL;
     MessageCenter::Shutdown();
   }
 
  protected:
   NotifierId DummyNotifierId() {
     return NotifierId();
   }
@@ skipping 223 matching lines @@
   model = message_center_tray_->CreateNotificationMenuModel(
       notifier_id2, base::string16());
   EXPECT_EQ(1, model->GetItemCount());
   EXPECT_EQ(second_command, model->GetCommandIdAt(0));
 
   // The command itself is disabled because delegate disables context menu.
   EXPECT_FALSE(model->IsEnabledAt(0));
 }
 
 }  // namespace message_center