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

ui/wm/core/nested_accelerator_delegate.h

-// Copyright (c) 2012 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_DELEGATE_H_
-#define UI_WM_CORE_NESTED_ACCELERATOR_DELEGATE_H_
-
-namespace ui {
-class KeyEvent;
-}
-
-namespace wm {
-
-// A delegate interface that implements the behavior of nested accelerator
-// handling.
-class NestedAcceleratorDelegate {
- public:
-  virtual ~NestedAcceleratorDelegate() {}
-
-  // If the key event should be ignored now and instead be reposted so that next
-  // event loop.
-  virtual bool ShouldProcessEventNow(const ui::KeyEvent& key_event) = 0;
-
-  // Attempts to process an accelerator for the key-event.
-  // Returns whether an accelerator was triggered and processed.
-  virtual bool ProcessEvent(const ui::KeyEvent& key_event) = 0;
-};
-
-}  // namespace wm
-
-#endif  // UI_WM_CORE_NESTED_ACCELERATOR_DELEGATE_H_