Refactor and move ash independent nested accelerator code to ui/wm/core

ash/accelerators/nested_dispatcher_controller.h

-// 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.
-
-#ifndef ASH_ACCELERATORS_NESTED_DISPATCHER_CONTROLLER_H_
-#define ASH_ACCELERATORS_NESTED_DISPATCHER_CONTROLLER_H_
-
-#include "ash/ash_export.h"
-#include "base/callback.h"
-#include "base/message_loop/message_loop.h"
-#include "ui/wm/public/dispatcher_client.h"
-
-namespace ash {
-
-class AcceleratorDispatcher;
-
-// Creates a dispatcher which wraps another dispatcher.
-// The outer dispatcher runs first and performs ash specific handling.
-// If it does not consume the event it forwards the event to the nested
-// dispatcher.
-class ASH_EXPORT NestedDispatcherController
-    : public aura::client::DispatcherClient {
- public:
-  NestedDispatcherController();
-  virtual ~NestedDispatcherController();
-
-  // aura::client::DispatcherClient:
-  virtual void RunWithDispatcher(
-      base::MessagePumpDispatcher* dispatcher) OVERRIDE;
-  virtual void QuitNestedMessageLoop() OVERRIDE;
-
- private:
-  base::Closure quit_closure_;
-  scoped_ptr<AcceleratorDispatcher> accelerator_dispatcher_;
-
-  DISALLOW_COPY_AND_ASSIGN(NestedDispatcherController);
-};
-
-}  // namespace ash
-
-#endif  // ASH_ACCELERATORS_NESTED_DISPATCHER_CONTROLLER_H_