Update {virtual,override,final} to follow C++11 style in ash.

ash/system/chromeos/rotation/tray_rotation_lock_unittest.cc

 // Copyright 2014 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/system/chromeos/rotation/tray_rotation_lock.h"
 
 #include "ash/ash_switches.h"
 #include "ash/content/display/screen_orientation_controller_chromeos.h"
 #include "ash/display/display_manager.h"
 #include "ash/root_window_controller.h"
@@ skipping 10 matching lines @@
 #include "base/time/time.h"
 #include "ui/events/event.h"
 #include "ui/events/event_constants.h"
 #include "ui/views/view.h"
 
 namespace ash {
 
 class TrayRotationLockTest : public test::AshTestBase {
  public:
   TrayRotationLockTest() {}
-  virtual ~TrayRotationLockTest() {}
+  ~TrayRotationLockTest() override {}
 
   TrayRotationLock* tray() {
     return tray_.get();
   }
 
   views::View* tray_view() {
     return tray_view_.get();
   }
 
   views::View* default_view() {
@@ skipping 174 matching lines @@
   ui::GestureEvent tap(
       0, 0, 0, base::TimeDelta(), ui::GestureEventDetails(ui::ET_GESTURE_TAP));
   default_view()->OnGestureEvent(&tap);
   EXPECT_TRUE(screen_orientation_controller->rotation_locked());
   EXPECT_TRUE(tray_view()->visible());
 
   maximize_mode_controller->EnableMaximizeModeWindowManager(false);
 }
 
 }  // namespace ash