Adds WindowManagerManager to mus

mash/wm/root_window_controller.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 MASH_WM_ROOT_WINDOW_CONTROLLER_H_
 #define MASH_WM_ROOT_WINDOW_CONTROLLER_H_
 
 #include "components/mus/public/cpp/window_observer.h"
 #include "components/mus/public/cpp/window_tree_delegate.h"
 #include "components/mus/public/interfaces/window_manager_constants.mojom.h"
@@ skipping 17 matching lines @@
 class WindowManager;
 class WindowManagerApplication;
 
 // RootWindowController manages the windows and state for a single display.
 //
 // RootWindowController deletes itself when the root mus::Window is destroyed.
 // You can trigger deletion explicitly by way of Destroy().
 class RootWindowController : public mus::WindowObserver,
                              public mus::WindowTreeDelegate {
  public:
-  static RootWindowController* CreateUsingWindowTreeHost(
-      WindowManagerApplication* app);
   static RootWindowController* CreateFromDisplay(
       WindowManagerApplication* app,
       mus::mojom::DisplayPtr display,
       mojo::InterfaceRequest<mus::mojom::WindowTreeClient> client_request);
 
   // Deletes this.
   void Destroy();
 
   mojo::Connector* GetConnector();
 
@@ skipping 33 matching lines @@
   WindowManagerApplication* app_;
   mus::Window* root_;
   int window_count_;
 
   scoped_ptr<WindowManager> window_manager_;
 
   std::map<mus::Window*, scoped_ptr<LayoutManager>> layout_manager_;
 
   scoped_ptr<ShadowController> shadow_controller_;
 
-  mus::mojom::WindowTreeHostPtr window_tree_host_;
-
   mus::mojom::DisplayPtr display_;
 
   DISALLOW_COPY_AND_ASSIGN(RootWindowController);
 };
 
 }  // namespace wm
 }  // namespace mash
 
 #endif  // MASH_WM_ROOT_WINDOW_CONTROLLER_H_