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

ash/system/tray/tray_image_item.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_image_item.h"
 
 #include "ash/system/tray/tray_item_view.h"
 #include "ash/system/tray/tray_views.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/image/image.h"
@@ skipping 25 matching lines @@
 views::View* TrayImageItem::CreateTrayView(user::LoginStatus status) {
   CHECK(tray_view_ == NULL);
   tray_view_ = new TrayItemView;
   tray_view_->CreateImageView();
   tray_view_->image_view()->SetImage(ui::ResourceBundle::GetSharedInstance().
       GetImageNamed(resource_id_).ToImageSkia());
   tray_view_->SetVisible(GetInitialVisibility());
   return tray_view_;
 }
 
-views::View* TrayImageItem::CreateDefaultView(user::LoginStatus status) {
+views::View* TrayImageItem::CreateDefaultView(user::LoginStatus status,
+                                              int bubble_width) {
   return NULL;
 }
 
 views::View* TrayImageItem::CreateDetailedView(user::LoginStatus status) {
   return NULL;
 }
 
 void TrayImageItem::UpdateAfterLoginStatusChange(user::LoginStatus status) {
 }
 
 void TrayImageItem::UpdateAfterShelfAlignmentChange(ShelfAlignment alignment) {
   SetTrayImageItemBorder(tray_view_, alignment);
 }
 
 void TrayImageItem::DestroyTrayView() {
   tray_view_ = NULL;
 }
 
 void TrayImageItem::DestroyDefaultView() {
 }
 
 void TrayImageItem::DestroyDetailedView() {
 }
 
 }  // namespace internal
 }  // namespace ash