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

ash/system/power/tray_power.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/power/tray_power.h"
 
 #include "ash/ash_switches.h"
 #include "ash/shell.h"
 #include "ash/system/date/date_view.h"
 #include "ash/system/power/power_status_view.h"
@@ skipping 166 matching lines @@
   // there is a battery or not. So always create this, and adjust visibility as
   // necessary.
   PowerSupplyStatus power_status =
       ash::Shell::GetInstance()->tray_delegate()->GetPowerSupplyStatus();
   CHECK(power_tray_ == NULL);
   power_tray_ = new tray::PowerTrayView();
   power_tray_->UpdatePowerStatus(power_status);
   return power_tray_;
 }
 
-views::View* TrayPower::CreateDefaultView(user::LoginStatus status) {
+views::View* TrayPower::CreateDefaultView(user::LoginStatus status,
+                                          int bubble_width) {
   // Make sure icon status is up-to-date. (Also triggers stub activation).
   ash::Shell::GetInstance()->tray_delegate()->RequestStatusUpdate();
   return NULL;
 }
 
 views::View* TrayPower::CreateNotificationView(user::LoginStatus status) {
   CHECK(notification_view_ == NULL);
   PowerSupplyStatus power_status =
       ash::Shell::GetInstance()->tray_delegate()->GetPowerSupplyStatus();
   if (!power_status.battery_is_present)
@@ skipping 67 matching lines @@
       return false;
     case NOTIFICATION_CRITICAL:
       return false;
   }
   NOTREACHED();
   return false;
 }
 
 }  // namespace internal
 }  // namespace ash