ash: Cleanup class/struct forward declarations

ash/wm/toplevel_window_event_handler.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_WM_TOPLEVEL_WINDOW_EVENT_HANDLER_H_
 #define ASH_WM_TOPLEVEL_WINDOW_EVENT_HANDLER_H_
 
 #include "ash/ash_export.h"
 #include "ash/common/wm/wm_toplevel_window_event_handler.h"
 #include "ash/common/wm/wm_types.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "ui/events/event_handler.h"
 #include "ui/wm/public/window_move_client.h"
 
 namespace aura {
 class Window;
 }
 
 namespace base {
 class RunLoop;
 }
 
 namespace ash {
 namespace wm {
-class WmGloblals;
 }
 
 class ASH_EXPORT ToplevelWindowEventHandler
     : public ui::EventHandler,
       public aura::client::WindowMoveClient {
  public:
   explicit ToplevelWindowEventHandler(WmShell* shell);
   ~ToplevelWindowEventHandler() override;
 
   // Overridden from ui::EventHandler:
@@ skipping 21 matching lines @@
   bool in_move_loop_ = false;
 
   base::WeakPtrFactory<ToplevelWindowEventHandler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ToplevelWindowEventHandler);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_TOPLEVEL_WINDOW_EVENT_HANDLER_H_