Make aura::clients take Window instead of RootWindow

ash/wm/drag_window_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/wm/drag_window_controller.h"
 
 #include "ash/shell_window_ids.h"
 #include "ash/wm/window_util.h"
 #include "ui/aura/client/screen_position_client.h"
+#include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
 #include "ui/compositor/layer.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/views/corewm/shadow_types.h"
 #include "ui/views/corewm/window_util.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 
 namespace ash {
 namespace internal {
@@ skipping 96 matching lines @@
   gfx::Rect layer_bounds = layer_->bounds();
   layer_bounds.set_origin(gfx::Point(0, 0));
   layer_->SetBounds(layer_bounds);
   layer_->SetVisible(false);
   // Detach it from the current container.
   layer_->parent()->Remove(layer_);
 }
 
 }  // namespace internal
 }  // namespace ash