Standardize usage of virtual/override/final specifiers.

ash/system/status_area_widget_delegate.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/system/status_area_widget_delegate.h"
 
 #include "ash/ash_export.h"
 #include "ash/ash_switches.h"
 #include "ash/focus_cycler.h"
 #include "ash/shell.h"
@@ skipping 20 matching lines @@
  public:
   explicit StatusAreaWidgetDelegateAnimationSettings(ui::Layer* layer)
       : ui::ScopedLayerAnimationSettings(layer->GetAnimator()) {
     SetTransitionDuration(
         base::TimeDelta::FromMilliseconds(kAnimationDurationMs));
     SetPreemptionStrategy(
         ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
     SetTweenType(gfx::Tween::EASE_IN_OUT);
   }
 
-  virtual ~StatusAreaWidgetDelegateAnimationSettings() {}
+  ~StatusAreaWidgetDelegateAnimationSettings() override {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(StatusAreaWidgetDelegateAnimationSettings);
 };
 
 }  // namespace
 
 namespace ash {
 
 StatusAreaWidgetDelegate::StatusAreaWidgetDelegate()
@@ skipping 111 matching lines @@
 void StatusAreaWidgetDelegate::ChildVisibilityChanged(View* child) {
   UpdateLayout();
 }
 
 void StatusAreaWidgetDelegate::UpdateWidgetSize() {
   if (GetWidget())
     GetWidget()->SetSize(GetPreferredSize());
 }
 
 }  // namespace ash