MacViews: Remove redundant virtuals in NativeWidgetMac and co.

ui/views/test/views_test_helper_mac.h

 // 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.
 
 #ifndef UI_VIEWS_TEST_VIEWS_TEST_HELPER_MAC_H_
 #define UI_VIEWS_TEST_VIEWS_TEST_HELPER_MAC_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/views/test/views_test_helper.h"
 
 namespace ui {
 class ScopedAnimationDurationScaleMode;
 }
 
 namespace views {
 
 class ViewsTestHelperMac : public ViewsTestHelper {
  public:
   ViewsTestHelperMac();
-  virtual ~ViewsTestHelperMac();
+  ~ViewsTestHelperMac() override;
 
  private:
   // Disable animations during tests.
   scoped_ptr<ui::ScopedAnimationDurationScaleMode> zero_duration_mode_;
 
   DISALLOW_COPY_AND_ASSIGN(ViewsTestHelperMac);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_TEST_VIEWS_TEST_HELPER_MAC_H_