Converts mash to use Shell

ash/display/window_tree_host_manager.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 ASH_DISPLAY_WINDOW_TREE_HOST_MANAGER_H_
 #define ASH_DISPLAY_WINDOW_TREE_HOST_MANAGER_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 98 matching lines @@
   aura::Window* GetRootWindowForDisplayId(int64_t id);
 
   // Returns AshWTH for given display |id|. Call results in CHECK failure
   // if the WTH does not exist.
   AshWindowTreeHost* GetAshWindowTreeHostForDisplayId(int64_t id);
 
   // Sets the primary display by display id. This re-assigns the current primary
   // root window host to to new primary display.
   void SetPrimaryDisplayId(int64_t id);
 
-  // Closes all child windows in the all root windows.
-  void CloseChildWindows();
-
   // Returns all root windows. In non extended desktop mode, this
   // returns the primary root window only.
   aura::Window::Windows GetAllRootWindows();
 
   // Returns all oot window controllers. In non extended desktop
   // mode, this return a RootWindowController for the primary root window only.
   std::vector<RootWindowController*> GetAllRootWindowControllers();
 
   // Gets/Sets/Clears the overscan insets for the specified |display_id|. See
   // display_manager.h for the details.
@@ skipping 80 matching lines @@
   int64_t cursor_display_id_for_restore_;
 
   base::WeakPtrFactory<WindowTreeHostManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowTreeHostManager);
 };
 
 }  // namespace ash
 
 #endif  // ASH_DISPLAY_WINDOW_TREE_HOST_MANAGER_H_