ash/wm: Remove dead code.

ui/wm/core/nested_accelerator_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 UI_WM_CORE_NESTED_ACCELERATOR_CONTROLLER_H_
-#define UI_WM_CORE_NESTED_ACCELERATOR_CONTROLLER_H_
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "base/message_loop/message_loop.h"
-#include "ui/wm/public/dispatcher_client.h"
-#include "ui/wm/wm_export.h"
-
-namespace wm {
-
-class NestedAcceleratorDelegate;
-class NestedAcceleratorDispatcher;
-
-// 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 WM_EXPORT NestedAcceleratorController
-    : public aura::client::DispatcherClient {
- public:
-  explicit NestedAcceleratorController(NestedAcceleratorDelegate* delegate);
-  ~NestedAcceleratorController() override;
-
-  // aura::client::DispatcherClient:
-  void PrepareNestedLoopClosures(base::MessagePumpDispatcher* dispatcher,
-                                 base::Closure* run_closure,
-                                 base::Closure* quit_closure) override;
-
- private:
-  void RunNestedMessageLoop(scoped_ptr<base::RunLoop> run_loop,
-                            scoped_ptr<NestedAcceleratorDispatcher> dispatcher);
-  void QuitNestedMessageLoop(const base::Closure& quit_runloop);
-
-  scoped_ptr<NestedAcceleratorDispatcher> accelerator_dispatcher_;
-  scoped_ptr<NestedAcceleratorDelegate> dispatcher_delegate_;
-
-  DISALLOW_COPY_AND_ASSIGN(NestedAcceleratorController);
-};
-
-}  // namespace wm
-
-#endif  // UI_WM_CORE_NESTED_ACCELERATOR_CONTROLLER_H_