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

ash/system/chromeos/settings/tray_settings.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/chromeos/settings/tray_settings.h"
 
 #include "ash/session/session_state_delegate.h"
 #include "ash/shell.h"
 #include "ash/system/chromeos/power/power_status.h"
 #include "ash/system/chromeos/power/power_status_view.h"
@@ skipping 53 matching lines @@
     }
 
     if (PowerStatus::Get()->IsBatteryPresent()) {
       power_status_view_ = new ash::PowerStatusView(
           ash::PowerStatusView::VIEW_DEFAULT, power_view_right_align);
       AddChildView(power_status_view_);
       OnPowerStatusChanged();
     }
   }
 
-  virtual ~SettingsDefaultView() {
-    PowerStatus::Get()->RemoveObserver(this);
-  }
+  ~SettingsDefaultView() override { PowerStatus::Get()->RemoveObserver(this); }
 
   // Overridden from ash::ActionableView.
-  virtual bool PerformAction(const ui::Event& event) override {
+  bool PerformAction(const ui::Event& event) override {
     bool userAddingRunning = ash::Shell::GetInstance()
                                  ->session_state_delegate()
                                  ->IsInSecondaryLoginScreen();
 
     if (login_status_ == user::LOGGED_IN_NONE ||
         login_status_ == user::LOGGED_IN_LOCKED || userAddingRunning)
       return false;
 
     ash::Shell::GetInstance()->system_tray_delegate()->ShowSettings();
     return true;
   }
 
   // Overridden from views::View.
-  virtual void Layout() override {
+  void Layout() override {
     views::View::Layout();
 
     if (label_ && power_status_view_) {
       // Let the box-layout do the layout first. Then move power_status_view_
       // to right align if it is created.
       gfx::Size size = power_status_view_->GetPreferredSize();
       gfx::Rect bounds(size);
       bounds.set_x(width() - size.width() - ash::kTrayPopupPaddingBetweenItems);
       bounds.set_y((height() - size.height()) / 2);
       power_status_view_->SetBoundsRect(bounds);
     }
   }
 
   // Overridden from views::View.
-  virtual void ChildPreferredSizeChanged(views::View* child) override {
+  void ChildPreferredSizeChanged(views::View* child) override {
     views::View::ChildPreferredSizeChanged(child);
     Layout();
   }
 
   // Overridden from PowerStatus::Observer.
-  virtual void OnPowerStatusChanged() override {
+  void OnPowerStatusChanged() override {
     if (!PowerStatus::Get()->IsBatteryPresent())
       return;
 
     base::string16 accessible_name = label_ ?
         label_->text() + base::ASCIIToUTF16(", ") +
             PowerStatus::Get()->GetAccessibleNameString(true) :
         PowerStatus::Get()->GetAccessibleNameString(true);
     SetAccessibleName(accessible_name);
   }
 
@@ skipping 42 matching lines @@
   default_view_ = NULL;
 }
 
 void TraySettings::DestroyDetailedView() {
 }
 
 void TraySettings::UpdateAfterLoginStatusChange(user::LoginStatus status) {
 }
 
 }  // namespace ash