Stop using shell::GetInstance()->system_tray() in system tray items

ash/system/tray/tray_details_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_DETAILS_VIEW_H_
 #define ASH_SYSTEM_TRAY_TRAY_DETAILS_VIEW_H_
 
 #include "ui/views/view.h"
 
 namespace views {
 class ScrollView;
 }
 
 namespace ash {
+
+class SystemTrayItem;
+
 namespace internal {
 
 class FixedSizedScrollView;
 class ScrollBorder;
 class SpecialPopupRow;
 class ViewClickListener;
 
 class TrayDetailsView : public views::View {
  public:
-  TrayDetailsView();
+  explicit TrayDetailsView(SystemTrayItem* owner);
   virtual ~TrayDetailsView();
 
   // Creates a row with special highlighting etc. This is typically the
   // bottom-most row in the popup.
   void CreateSpecialRow(int string_id, ViewClickListener* listener);
 
   // Creates a scrollable list. The list has a border at the bottom if there is
   // any other view between the list and the footer row at the bottom.
   void CreateScrollableList();
 
   // Removes (and destroys) all child views.
   void Reset();
 
+  SystemTrayItem* owner() const { return owner_; }
   SpecialPopupRow* footer() const { return footer_; }
   FixedSizedScrollView* scroller() const { return scroller_; }
   views::View* scroll_content() const { return scroll_content_; }
 
  protected:
   // Overridden from views::View.
   virtual void Layout() OVERRIDE;
   virtual void OnPaintBorder(gfx::Canvas* canvas) OVERRIDE;
 
  private:
+  SystemTrayItem* owner_;
   SpecialPopupRow* footer_;
   FixedSizedScrollView* scroller_;
   views::View* scroll_content_;
   ScrollBorder* scroll_border_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayDetailsView);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_TRAY_DETAILS_VIEW_H_