chromeos: Eliminate WmWindow from //ash/system

ash/system/tray/tray_bubble_wrapper.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/system/tray/tray_bubble_wrapper.h"
 
 #include "ash/system/tray/tray_background_view.h"
 #include "ash/system/tray/tray_event_filter.h"
-#include "ash/wm_window.h"
+#include "ui/aura/window.h"
 #include "ui/views/bubble/tray_bubble_view.h"
 #include "ui/views/widget/widget.h"
 
 namespace ash {
 
 TrayBubbleWrapper::TrayBubbleWrapper(TrayBackgroundView* tray,
                                      views::TrayBubbleView* bubble_view)
     : tray_(tray), bubble_view_(bubble_view) {
   bubble_widget_ = views::BubbleDialogDelegateView::CreateBubble(bubble_view_);
   bubble_widget_->AddObserver(this);
@@ skipping 15 matching lines @@
 
 void TrayBubbleWrapper::OnWidgetDestroying(views::Widget* widget) {
   CHECK_EQ(bubble_widget_, widget);
   bubble_widget_->RemoveObserver(this);
   bubble_widget_ = NULL;
 
   // Although the bubble is already closed, the next mouse release event
   // will invoke PerformAction which reopens the bubble again. To prevent the
   // reopen, the mouse capture of |tray_| has to be released.
   // See crbug.com/177075
-  WmWindow::Get(tray_->GetWidget()->GetNativeWindow())->ReleaseCapture();
+  tray_->GetWidget()->GetNativeWindow()->ReleaseCapture();
 
   tray_->HideBubbleWithView(bubble_view_);  // May destroy |bubble_view_|
 }
 
 void TrayBubbleWrapper::OnWidgetBoundsChanged(views::Widget* widget,
                                               const gfx::Rect& new_bounds) {
   DCHECK_EQ(bubble_widget_, widget);
   tray_->BubbleResized(bubble_view_);
 }
 
 }  // namespace ash