Revert 126700 because it broke clang on chromeos.

ash/system/tray/system_tray.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_SYSTEM_TRAY_H_
 #define ASH_SYSTEM_TRAY_SYSTEM_TRAY_H_
 #pragma once
 
 #include "ash/ash_export.h"
 #include "ash/system/user/login_status.h"
@@ skipping 16 matching lines @@
  public:
   SystemTray();
   virtual ~SystemTray();
 
   // Adds a new item in the tray.
   void AddTrayItem(SystemTrayItem* item);
 
   // Removes an existing tray item.
   void RemoveTrayItem(SystemTrayItem* item);
 
-  // Shows the default view of all items.
-  void ShowDefaultView();
-
   // Shows details of a particular item. If |close_delay_in_seconds| is
   // non-zero, then the view is automatically closed after the specified time.
   void ShowDetailedView(SystemTrayItem* item,
                         int close_delay_in_seconds,
                         bool activate);
 
   // Updates the items when the login status of the system changes.
   void UpdateAfterLoginStatusChange(user::LoginStatus login_status);
 
   const std::vector<SystemTrayItem*>& items() const { return items_; }
@@ skipping 20 matching lines @@
   // The popup widget and the delegate.
   internal::SystemTrayBubble* bubble_;
   views::Widget* popup_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemTray);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_SYSTEM_TRAY_H_