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

ash/system/chromeos/multi_user/user_switch_util.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/multi_user/user_switch_util.h"
 
 #include "ash/shell.h"
 #include "ash/system/chromeos/screen_security/screen_tray_item.h"
 #include "ash/system/tray/system_tray.h"
 #include "grit/ash_strings.h"
@@ skipping 14 matching lines @@
 
 const int kPaddingToMessage = 30;
 const int kInset = 40;
 const int kTopInset = 10;
 
 ////////////////////////////////////////////////////////////////////////////////
 // Dialog for multi-profiles desktop casting warning.
 class DesktopCastingWarningView : public views::DialogDelegateView {
  public:
   DesktopCastingWarningView(base::Callback<void()> on_accept);
-  virtual ~DesktopCastingWarningView();
+  ~DesktopCastingWarningView() override;
 
   static void ShowDialog(const base::Callback<void()> on_accept);
 
   // views::DialogDelegate overrides.
-  virtual bool Accept() override;
-  virtual base::string16 GetDialogButtonLabel(
-        ui::DialogButton button) const override;
-  virtual bool IsDialogButtonEnabled(ui::DialogButton button) const override;
-  virtual int GetDefaultDialogButton() const override;
+  bool Accept() override;
+  base::string16 GetDialogButtonLabel(ui::DialogButton button) const override;
+  bool IsDialogButtonEnabled(ui::DialogButton button) const override;
+  int GetDefaultDialogButton() const override;
 
   // views::WidgetDelegate overrides.
-  virtual ui::ModalType GetModalType() const override;
+  ui::ModalType GetModalType() const override;
 
   // views::View overrides.
-  virtual gfx::Size GetPreferredSize() const override;
+  gfx::Size GetPreferredSize() const override;
 
  private:
   void InitDialog();
 
   const base::Callback<void()> on_switch_;
 
   DISALLOW_COPY_AND_ASSIGN(DesktopCastingWarningView);
 };
 
 // The current instance of the running dialog - or NULL. This is used for
@@ skipping 129 matching lines @@
   if (!instance_for_test)
     return false;
   if (accept)
     instance_for_test->Accept();
   delete instance_for_test->GetWidget()->GetNativeWindow();
   CHECK(!instance_for_test);
   return true;
 }
 
 }  // namespace chromeos