Convert TrayBubbleView to wm common types

ash/system/tray/tray_background_view.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_background_view.h"
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/shelf/shelf_constants.h"
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/common/shelf/wm_shelf_util.h"
@@ skipping 405 matching lines @@
 
 void TrayBackgroundView::HideTransformation() {
   gfx::Transform transform;
   if (IsHorizontalAlignment(shelf_alignment_))
     transform.Translate(width(), 0.0f);
   else
     transform.Translate(0.0f, height());
   layer()->SetTransform(transform);
 }
 
-aura::Window* TrayBackgroundView::GetBubbleWindowContainer() const {
-  return ash::Shell::GetContainer(
-      tray_container()->GetWidget()->GetNativeWindow()->GetRootWindow(),
-      ash::kShellWindowId_SettingBubbleContainer);
-}
-
 gfx::Rect TrayBackgroundView::GetBubbleAnchorRect(
     views::Widget* anchor_widget,
     TrayBubbleView::AnchorType anchor_type,
     TrayBubbleView::AnchorAlignment anchor_alignment) const {
   gfx::Rect rect;
   if (anchor_widget && anchor_widget->IsVisible()) {
     rect = anchor_widget->GetWindowBoundsInScreen();
     if (anchor_type == TrayBubbleView::ANCHOR_TYPE_TRAY) {
       if (anchor_alignment == TrayBubbleView::ANCHOR_ALIGNMENT_BOTTOM) {
         bool rtl = base::i18n::IsRTL();
@@ skipping 85 matching lines @@
     return;
   SchedulePaint();
 }
 
 void TrayBackgroundView::UpdateBubbleViewArrow(
     views::TrayBubbleView* bubble_view) {
   // Nothing to do here.
 }
 
 }  // namespace ash