Standardize usage of virtual/override/final specifiers.

chrome/browser/media/desktop_media_list_ash_unittest.cc

 // 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.
 
 #include "chrome/browser/media/desktop_media_list_ash.h"
 
 #include "ash/test/ash_test_base.h"
 #include "base/message_loop/message_loop.h"
 #include "chrome/browser/media/desktop_media_list_observer.h"
 #include "testing/gmock/include/gmock/gmock.h"
@@ skipping 10 matching lines @@
   MOCK_METHOD1(OnSourceAdded, void(int index));
   MOCK_METHOD1(OnSourceRemoved, void(int index));
   MOCK_METHOD2(OnSourceMoved, void(int old_index, int new_index));
   MOCK_METHOD1(OnSourceNameChanged, void(int index));
   MOCK_METHOD1(OnSourceThumbnailChanged, void(int index));
 };
 
 class DesktopMediaListAshTest : public ash::test::AshTestBase {
  public:
   DesktopMediaListAshTest() {}
-  virtual ~DesktopMediaListAshTest() {}
+  ~DesktopMediaListAshTest() override {}
 
   void CreateList(int source_types) {
     list_.reset(new DesktopMediaListAsh(source_types));
     list_->SetThumbnailSize(gfx::Size(kThumbnailSize, kThumbnailSize));
 
     // Set update period to reduce the time it takes to run tests.
     list_->SetUpdatePeriod(base::TimeDelta::FromMilliseconds(1));
   }
 
  protected:
@@ skipping 63 matching lines @@
       .WillOnce(QuitMessageLoop())
       .WillRepeatedly(DoDefault());
   EXPECT_CALL(observer_, OnSourceRemoved(0))
       .WillOnce(QuitMessageLoop());
 
   list_->StartUpdating(&observer_);
   base::MessageLoop::current()->Run();
   window.reset();
   base::MessageLoop::current()->Run();
 }