[mus+ash] Removes WmWindow from window_positioning_utils

ash/display/screen_position_controller.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/display/screen_position_controller.h"
 
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/shell.h"
 #include "ash/shell_port.h"
 #include "ash/wm/window_positioning_utils.h"
@@ skipping 99 matching lines @@
 }
 
 void ScreenPositionController::SetBounds(aura::Window* window,
                                          const gfx::Rect& bounds,
                                          const display::Display& display) {
   if (!window->parent()->GetProperty(kUsesScreenCoordinatesKey)) {
     window->SetBounds(bounds);
     return;
   }
 
-  wm::SetBoundsInScreen(WmWindow::Get(window), bounds, display);
+  wm::SetBoundsInScreen(window, bounds, display);
 }
 
 }  // namespace ash