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

ash/system/chromeos/tray_display.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/chromeos/tray_display.h"
 
 #include "ash/display/display_controller.h"
 #include "ash/display/display_manager.h"
 #include "ash/screen_ash.h"
 #include "ash/shell.h"
@@ skipping 107 matching lines @@
     : default_(NULL) {
   Shell::GetScreen()->AddObserver(this);
   Shell::GetInstance()->output_configurator()->AddObserver(this);
 }
 
 TrayDisplay::~TrayDisplay() {
   Shell::GetScreen()->RemoveObserver(this);
   Shell::GetInstance()->output_configurator()->RemoveObserver(this);
 }
 
-views::View* TrayDisplay::CreateDefaultView(user::LoginStatus status) {
+views::View* TrayDisplay::CreateDefaultView(user::LoginStatus status,
+                                            int bubble_width) {
   default_ = new DisplayView(status);
   return default_;
 }
 
 void TrayDisplay::DestroyDefaultView() {
   default_ = NULL;
 }
 
 void TrayDisplay::OnDisplayBoundsChanged(const gfx::Display& display) {
   if (default_)
@@ skipping 10 matching lines @@
     default_->Update();
 }
 
 void TrayDisplay::OnDisplayModeChanged() {
   if (default_)
     default_->Update();
 }
 
 }  // namespace internal
 }  // namespace ash