chromeos: Remove TrayBubbleView::Delegate::OnBeforeBubbleWidgetInit

ash/system/tray/tray_background_view.h

 // 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.
 
 #ifndef ASH_SYSTEM_TRAY_TRAY_BACKGROUND_VIEW_H_
 #define ASH_SYSTEM_TRAY_TRAY_BACKGROUND_VIEW_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 81 matching lines @@
   // Updates the visibility of this tray's separator.
   void set_separator_visibility(bool visible) { separator_visible_ = visible; }
 
   // Gets the anchor for bubbles, which is tray_container().
   views::View* GetBubbleAnchor() const;
 
   // Gets additional insets for positioning bubbles relative to
   // tray_container().
   gfx::Insets GetBubbleAnchorInsets() const;
 
+  // Returns the container window for the bubble (on the proper display).
+  aura::Window* GetBubbleWindowContainer() const;
+
  protected:
   // ActionableView:
   std::unique_ptr<views::InkDropMask> CreateInkDropMask() const override;
   bool ShouldEnterPushedState(const ui::Event& event) override;
   bool PerformAction(const ui::Event& event) override;
   void HandlePerformActionResult(bool action_performed,
                                  const ui::Event& event) override;
   void OnPaintFocus(gfx::Canvas* canvas) override;
 
  private:
@@ skipping 33 matching lines @@
 
   std::unique_ptr<TrayWidgetObserver> widget_observer_;
   std::unique_ptr<TrayEventFilter> tray_event_filter_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayBackgroundView);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_TRAY_BACKGROUND_VIEW_H_