Standardize usage of virtual/override/final specifiers.

ash/wm/stacking_controller_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 "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/wm/window_properties.h"
 #include "ash/wm/window_util.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_event_dispatcher.h"
 #include "ui/wm/core/window_util.h"
 
 using aura::Window;
 
 namespace ash {
 
 class StackingControllerTest : public test::AshTestBase {
  public:
   StackingControllerTest() {}
-  virtual ~StackingControllerTest() {}
+  ~StackingControllerTest() override {}
 
   aura::Window* CreateTestWindow() {
     aura::Window* window = new aura::Window(NULL);
     window->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_NORMAL);
     window->SetType(ui::wm::WINDOW_TYPE_NORMAL);
     window->Init(aura::WINDOW_LAYER_TEXTURED);
     return window;
   }
 
  private:
@@ skipping 20 matching lines @@
   ParentWindowInPrimaryRootWindow(w1.get());
   w1->Show();
   wm::ActivateWindow(w1.get());
 
   // The window with the transient parent should get added to the same container
   // as its transient parent.
   EXPECT_EQ(launcher, w1->parent());
 }
 
 }  // namespace ash