Removes most aura dependencies from WindowResizer

ash/wm/coordinate_conversion.cc

-// 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.
-
-#include "ash/wm/coordinate_conversion.h"
-
-#include "ash/display/window_tree_host_manager.h"
-#include "ash/shell.h"
-#include "ui/aura/client/screen_position_client.h"
-#include "ui/gfx/display.h"
-#include "ui/gfx/geometry/point.h"
-#include "ui/gfx/geometry/rect.h"
-#include "ui/gfx/screen.h"
-
-namespace ash {
-namespace wm {
-
-aura::Window* GetRootWindowAt(const gfx::Point& point) {
-  const gfx::Display& display =
-      gfx::Screen::GetScreen()->GetDisplayNearestPoint(point);
-  DCHECK(display.is_valid());
-  // TODO(yusukes): Move coordinate_conversion.cc and .h to ui/aura/ once
-  // GetRootWindowForDisplayId() is moved to aura::Env.
-  return Shell::GetInstance()
-      ->window_tree_host_manager()
-      ->GetRootWindowForDisplayId(display.id());
-}
-
-aura::Window* GetRootWindowMatching(const gfx::Rect& rect) {
-  const gfx::Display& display =
-      gfx::Screen::GetScreen()->GetDisplayMatching(rect);
-  return Shell::GetInstance()
-      ->window_tree_host_manager()
-      ->GetRootWindowForDisplayId(display.id());
-}
-
-}  // namespace wm
-}  // namespace ash