ash/wm: Remove dead code.

ui/wm/core/nested_accelerator_dispatcher.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_DISPATCHER_H_
-#define UI_WM_CORE_NESTED_ACCELERATOR_DISPATCHER_H_
-
-#include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
-#include "ui/wm/wm_export.h"
-
-namespace base {
-class MessagePumpDispatcher;
-class RunLoop;
-}
-
-namespace ui {
-class KeyEvent;
-}
-
-namespace wm {
-
-class NestedAcceleratorDelegate;
-
-// Dispatcher for handling accelerators from menu.
-//
-// Wraps a nested dispatcher to which control is passed if no accelerator key
-// has been pressed. If the nested dispatcher is NULL, then the control is
-// passed back to the default dispatcher.
-// TODO(pkotwicz): Add support for a |nested_dispatcher| which sends
-//  events to a system IME.
-class WM_EXPORT NestedAcceleratorDispatcher {
- public:
-  virtual ~NestedAcceleratorDispatcher();
-
-  static scoped_ptr<NestedAcceleratorDispatcher> Create(
-      NestedAcceleratorDelegate* dispatcher_delegate,
-      base::MessagePumpDispatcher* nested_dispatcher);
-
-  // Creates a base::RunLoop object to run a nested message loop.
-  virtual scoped_ptr<base::RunLoop> CreateRunLoop() = 0;
-
- protected:
-  explicit NestedAcceleratorDispatcher(NestedAcceleratorDelegate* delegate);
-
-  NestedAcceleratorDelegate*
-      delegate_;  // Owned by NestedAcceleratorController.
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(NestedAcceleratorDispatcher);
-};
-
-}  // namespace wm
-
-#endif  // UI_WM_CORE_NESTED_ACCELERATOR_DISPATCHER_H_