Removing deprecated GTK-Views code.

ui/views/controls/menu/menu_gtk.h

-// Copyright (c) 2011 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_CONTROLS_MENU_MENU_GTK_H_
-#define UI_VIEWS_CONTROLS_MENU_MENU_GTK_H_
-#pragma once
-
-#include "base/basictypes.h"
-#include "base/compiler_specific.h"
-#include "ui/views/controls/menu/menu.h"
-
-namespace views {
-
-class MenuGtk : public Menu {
- public:
-  // Construct a Menu using the specified controller to determine command
-  // state.
-  // delegate     A Menu::Delegate implementation that provides more
-  //              information about the Menu presentation.
-  // anchor       An alignment hint for the popup menu.
-  // owner        The window that the menu is being brought up relative
-  //              to. Not actually used for anything but must not be
-  //              NULL.
-  MenuGtk(Delegate* d, AnchorPoint anchor, gfx::NativeView owner);
-  virtual ~MenuGtk();
-
-  // Overridden from Menu:
-  virtual Menu* AddSubMenuWithIcon(int index,
-                                   int item_id,
-                                   const string16& label,
-                                   const SkBitmap& icon) OVERRIDE;
-  virtual void AddSeparator(int index) OVERRIDE;
-  virtual void EnableMenuItemByID(int item_id, bool enabled) OVERRIDE;
-  virtual void EnableMenuItemAt(int index, bool enabled) OVERRIDE;
-  virtual void SetMenuLabel(int item_id, const string16& label) OVERRIDE;
-  virtual bool SetIcon(const SkBitmap& icon, int item_id) OVERRIDE;
-  virtual void RunMenuAt(int x, int y) OVERRIDE;
-  virtual void Cancel() OVERRIDE;
-  virtual int ItemCount() OVERRIDE;
-
- protected:
-  virtual void AddMenuItemInternal(int index,
-                                   int item_id,
-                                   const string16& label,
-                                   const SkBitmap& icon,
-                                   MenuItemType type) OVERRIDE;
-
-  DISALLOW_COPY_AND_ASSIGN(MenuGtk);
-};
-
-}  // namespace views
-
-#endif  // UI_VIEWS_CONTROLS_MENU_MENU_GTK_H_