Removes most aura dependencies from WindowResizer

ash/wm/coordinate_conversion.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_COORDINATE_CONVERSION_H_
-#define ASH_WM_COORDINATE_CONVERSION_H_
-
-#include "ash/ash_export.h"
-
-namespace aura {
-class Window;
-}  // namespace gfx
-
-namespace gfx {
-class Point;
-class Rect;
-}  // namespace gfx
-
-namespace ash {
-namespace wm {
-
-// Returns the RootWindow at |point| in the virtual screen coordinates.
-// Returns NULL if the root window does not exist at the given
-// point.
-ASH_EXPORT aura::Window* GetRootWindowAt(const gfx::Point& point);
-
-// Returns the RootWindow that shares the most area with |rect| in
-// the virtual scren coordinates.
-ASH_EXPORT aura::Window* GetRootWindowMatching(const gfx::Rect& rect);
-
-}  // namespace wm
-}  // namespace ash
-
-#endif  // ASH_WM_COORDINATE_CONVERSION_H_