Moves RootWindowControllerCommon and LayoutManager to common

ash/root_window_controller_common.h

-// Copyright 2016 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_ROOT_WINDOW_CONTROLLER_COMMON_H_
-#define ASH_ROOT_WINDOW_CONTROLLER_COMMON_H_
-
-#include "base/macros.h"
-
-namespace ash {
-namespace wm {
-class RootWindowLayoutManager;
-class WmWindow;
-}
-
-// This will eventually become what is RootWindowController. During the
-// transition it contains code used by both the aura and mus implementations.
-// It should *not* contain any aura specific code.
-class RootWindowControllerCommon {
- public:
-  explicit RootWindowControllerCommon(wm::WmWindow* root);
-  ~RootWindowControllerCommon();
-
-  // Creates the containers (WmWindows) used by the shell.
-  void CreateContainers();
-
-  // Creates the LayoutManagers for the windows created by CreateContainers().
-  void CreateLayoutManagers();
-
-  wm::RootWindowLayoutManager* root_window_layout() {
-    return root_window_layout_;
-  }
-
- private:
-  wm::WmWindow* root_;
-
-  wm::RootWindowLayoutManager* root_window_layout_;
-
-  DISALLOW_COPY_AND_ASSIGN(RootWindowControllerCommon);
-};
-
-}  // namespace ash
-
-#endif  // ASH_ROOT_WINDOW_CONTROLLER_COMMON_H_