mash: Fix crash when clicking on the shelf overflow icon

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 50 matching lines @@
 
     DISALLOW_COPY_AND_ASSIGN(TrayContainer);
   };
 
   explicit TrayBackgroundView(StatusAreaWidget* status_area_widget);
   ~TrayBackgroundView() override;
 
   // Called after the tray has been added to the widget containing it.
   virtual void Initialize();
 
+  // Initializes animations for the bubble.
+  static void InitializeBubbleAnimations(views::Widget* bubble_widget);
+
   // views::View:
   void SetVisible(bool visible) override;
   const char* GetClassName() const override;
   void OnMouseEntered(const ui::MouseEvent& event) override;
   void OnMouseExited(const ui::MouseEvent& event) override;
   void ChildPreferredSizeChanged(views::View* child) override;
   void GetAccessibleState(ui::AXViewState* state) override;
   void AboutToRequestFocusFromTabTraversal(bool reverse) override;
 
   // ActionableView:
@@ skipping 28 matching lines @@
   void SetContents(views::View* contents);
 
   // Creates and sets contents background to |background_|.
   void SetContentsBackground();
 
   // Sets whether the tray paints a background. Default is true, but is set to
   // false if a window overlaps the shelf.
   void SetPaintsBackground(bool value,
                            BackgroundAnimatorChangeType change_type);
 
-  // Initializes animations for the bubble.
-  void InitializeBubbleAnimations(views::Widget* bubble_widget);
-
   // Returns the window hosting the bubble.
   aura::Window* GetBubbleWindowContainer() const;
 
   // Returns the anchor rect for the bubble.
   gfx::Rect GetBubbleAnchorRect(
       views::Widget* anchor_widget,
       views::TrayBubbleView::AnchorType anchor_type,
       views::TrayBubbleView::AnchorAlignment anchor_alignment) const;
 
   // Returns the bubble anchor alignment based on |shelf_alignment_|.
@@ skipping 60 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_