Removes most aura dependencies from DockedWindowResizer

ash/wm/dock/docked_window_resizer.h

 // Copyright (c) 2013 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_DOCK_DOCK_WINDOW_RESIZER_H_
 #define ASH_WM_DOCK_DOCK_WINDOW_RESIZER_H_
 
 #include <memory>
 
 #include "ash/wm/dock/dock_types.h"
 #include "ash/wm/window_resizer.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 
 namespace gfx {
 class Point;
 class Rect;
 }
 
-namespace aura {
-class RootWindow;
-}
-
 namespace ash {
 class DockedWindowLayoutManager;
 
 // DockWindowResizer is used by ToplevelWindowEventFilter to handle dragging,
 // moving or resizing of a window while it is docked to the side of a screen.
 class ASH_EXPORT DockedWindowResizer : public WindowResizer {
  public:
   ~DockedWindowResizer() override;
 
   // Creates a new DockWindowResizer. The caller takes ownership of the
@@ skipping 61 matching lines @@
   bool was_bounds_changed_by_user_;
 
   base::WeakPtrFactory<DockedWindowResizer> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DockedWindowResizer);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_DOCK_DOCK_WINDOW_RESIZER_H_