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

ui/wm/core/nested_accelerator_dispatcher.cc

+// 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.
+
+#include "ui/wm/core/nested_accelerator_dispatcher.h"
+
+#include "base/logging.h"
+#include "ui/wm/core/nested_accelerator_delegate.h"
+
+namespace wm {
+
+NestedAcceleratorDispatcher::NestedAcceleratorDispatcher(
+    NestedAcceleratorDelegate* delegate)
+    : delegate_(delegate) {
+  DCHECK(delegate);
+}
+
+NestedAcceleratorDispatcher::~NestedAcceleratorDispatcher() {
+}
+
+}  // namespace wm