Standardize usage of virtual/override/final specifiers.

chrome/browser/ui/views/frame/browser_desktop_window_tree_host_x11.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_DESKTOP_WINDOW_TREE_HOST_X11_H_
 #define CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_DESKTOP_WINDOW_TREE_HOST_X11_H_
 
 #include "ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h"
 #include "chrome/browser/ui/views/frame/browser_desktop_window_tree_host.h"
 #include "chrome/browser/ui/views/frame/global_menu_bar_x11.h"
 
 class BrowserFrame;
 class BrowserView;
 
 namespace views {
 class DesktopNativeWidgetAura;
 }
 
 class BrowserDesktopWindowTreeHostX11
     : public BrowserDesktopWindowTreeHost,
       public views::DesktopWindowTreeHostX11 {
  public:
   BrowserDesktopWindowTreeHostX11(
       views::internal::NativeWidgetDelegate* native_widget_delegate,
       views::DesktopNativeWidgetAura* desktop_native_widget_aura,
       BrowserView* browser_view,
       BrowserFrame* browser_frame);
-  virtual ~BrowserDesktopWindowTreeHostX11();
+  ~BrowserDesktopWindowTreeHostX11() override;
 
  private:
   // Overridden from BrowserDesktopWindowTreeHost:
-  virtual DesktopWindowTreeHost* AsDesktopWindowTreeHost() override;
-  virtual int GetMinimizeButtonOffset() const override;
-  virtual bool UsesNativeSystemMenu() const override;
+  DesktopWindowTreeHost* AsDesktopWindowTreeHost() override;
+  int GetMinimizeButtonOffset() const override;
+  bool UsesNativeSystemMenu() const override;
 
   // Overridden from views::DesktopWindowTreeHostX11:
-  virtual void Init(
-      aura::Window* content_window,
-      const views::Widget::InitParams& params) override;
-  virtual void CloseNow() override;
+  void Init(aura::Window* content_window,
+            const views::Widget::InitParams& params) override;
+  void CloseNow() override;
 
   BrowserView* browser_view_;
 
   // Each browser frame maintains its own menu bar object because the lower
   // level dbus protocol associates a xid to a menu bar; we can't map multiple
   // xids to the same menu bar.
   scoped_ptr<GlobalMenuBarX11> global_menu_bar_x11_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserDesktopWindowTreeHostX11);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_DESKTOP_WINDOW_TREE_HOST_X11_H_