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

ash/system/tray_accessibility.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_accessibility.h"
 
 #include "ash/shell.h"
 #include "ash/shell_delegate.h"
 #include "ash/system/tray/tray_constants.h"
 #include "ash/system/tray/tray_views.h"
@@ skipping 52 matching lines @@
       detailed_(NULL) {
 }
 
 TrayAccessibility::~TrayAccessibility() {}
 
 bool TrayAccessibility::GetInitialVisibility() {
   return Shell::GetInstance()->delegate() &&
       Shell::GetInstance()->delegate()->IsSpokenFeedbackEnabled();
 }
 
-views::View* TrayAccessibility::CreateDefaultView(user::LoginStatus status) {
+views::View* TrayAccessibility::CreateDefaultView(user::LoginStatus status,
+                                                  int bubble_width) {
   if (!Shell::GetInstance()->delegate()->IsSpokenFeedbackEnabled())
     return NULL;
 
   CHECK(default_ == NULL);
   default_ = new DefaultAccessibilityView();
 
   return default_;
 }
 
 views::View* TrayAccessibility::CreateDetailedView(user::LoginStatus status) {
@@ skipping 30 matching lines @@
 
   if (enabled) {
     PopupDetailedView(kTrayPopupAutoCloseDelayForTextInSeconds, false);
   } else if (detailed_) {
     detailed_->GetWidget()->Close();
   }
 }
 
 }  // namespace internal
 }  // namespace ash