mash: Move ash/common/wm/shelf to ash/common/shelf

ash/common/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 ASH_COMMON_WM_ROOT_WINDOW_CONTROLLER_H_
 #define ASH_COMMON_WM_ROOT_WINDOW_CONTROLLER_H_
 
 #include "ash/ash_export.h"
 #include "ash/common/wm/workspace/workspace_types.h"
 #include "ui/views/widget/widget.h"
 
 namespace gfx {
 class Point;
 }
 
 namespace ash {
 
 class AlwaysOnTopController;
+class WmShelf;
 class WmShell;
 class WmRootWindowControllerObserver;
 class WmWindow;
 
-namespace wm {
-class WmShelf;
-}
-
 // Provides state associated with a root of a window hierarchy.
 class ASH_EXPORT WmRootWindowController {
  public:
   virtual ~WmRootWindowController() {}
 
   virtual bool HasShelf() = 0;
 
   virtual WmShell* GetShell() = 0;
 
   virtual wm::WorkspaceWindowState GetWorkspaceWindowState() = 0;
 
   virtual AlwaysOnTopController* GetAlwaysOnTopController() = 0;
 
-  virtual wm::WmShelf* GetShelf() = 0;
+  virtual WmShelf* GetShelf() = 0;
 
   // Returns the window associated with this WmRootWindowController.
   virtual WmWindow* GetWindow() = 0;
 
   // Configures |init_params| prior to initializing |widget|.
   // |shell_container_id| is the id of the container to parent |widget| to.
   virtual void ConfigureWidgetInitParamsForContainer(
       views::Widget* widget,
       int shell_container_id,
       views::Widget::InitParams* init_params) = 0;
 
   // Returns the window events will be targeted at for the specified location
   // (in screen coordinates).
   //
   // NOTE: the returned window may not contain the location as resize handles
   // may extend outside the bounds of the window.
   virtual WmWindow* FindEventTarget(const gfx::Point& location_in_screen) = 0;
 
   virtual void AddObserver(WmRootWindowControllerObserver* observer) = 0;
   virtual void RemoveObserver(WmRootWindowControllerObserver* observer) = 0;
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_ROOT_WINDOW_CONTROLLER_H_