Removing deprecated GTK-Views code.

ui/views/controls/menu/nested_dispatcher_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_NESTED_DISPATCHER_GTK_H_
-#define UI_VIEWS_CONTROLS_MENU_NESTED_DISPATCHER_GTK_H_
-#pragma once
-
-#include "base/compiler_specific.h"
-#include "base/message_loop.h"
-
-namespace views {
-
-// A nested dispatcher that can out-live the creator of this
-// dispatcher. This is to deal with the scenario where a menu object
-// is deleted while it's handling the message loop.  Note that
-// |RunAndSelfDestruct| method always delete itself regardless of
-// whether or not the menu object is deleted, so a menu object should
-// create a new instance for each open request.
-// http://crosbug.com/7228, http://crosbug.com/7929
-class NestedDispatcherGtk : public MessageLoopForUI::Dispatcher {
- public:
-  NestedDispatcherGtk(MessageLoopForUI::Dispatcher* creator,
-                      bool allow_nested_task);
-
-  // Run the messsage loop and returns if the menu has been
-  // deleted in the nested loop. Returns true if the menu is
-  // deleted, or false otherwise.
-  bool RunAndSelfDestruct();
-
-  // Tells the nested dispatcher that creator has been destroyed.
-  void CreatorDestroyed();
-
- private:
-  virtual ~NestedDispatcherGtk() {}
-
-  // Overriden from MessageLoopForUI::Dispatcher:
-  virtual bool Dispatch(GdkEvent* event) OVERRIDE;
-
-  // Creator of the nested loop.
-  MessageLoopForUI::Dispatcher* creator_;
-
-  // True to allow nested task in the message loop.
-  bool allow_nested_task_;
-
-  DISALLOW_COPY_AND_ASSIGN(NestedDispatcherGtk);
-};
-
-}  // namespace views
-
-#endif  // UI_VIEWS_CONTROLS_MENU_NESTED_DISPATCHER_GTK_H_