Revert 126700 because it broke clang on chromeos.

ash/system/tray/system_tray.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/system_tray.h"
 
 #include "ash/shell.h"
 #include "ash/shell/panel_window.h"
 #include "ash/shell_window_ids.h"
 #include "ash/system/tray/system_tray_delegate.h"
@@ skipping 303 matching lines @@
   if (tray_item) {
     container_->AddChildViewAt(tray_item, 0);
     PreferredSizeChanged();
   }
 }
 
 void SystemTray::RemoveTrayItem(SystemTrayItem* item) {
   NOTIMPLEMENTED();
 }
 
-void SystemTray::ShowDefaultView() {
-  if (popup_) {
-    popup_->RemoveObserver(this);
-    popup_->Close();
-  }
-  popup_ = NULL;
-  bubble_ = NULL;
-
-  ShowItems(items_, false, true);
-}
-
 void SystemTray::ShowDetailedView(SystemTrayItem* item,
                                   int close_delay,
                                   bool activate) {
   if (popup_) {
     popup_->RemoveObserver(this);
     popup_->Close();
   }
   popup_ = NULL;
   bubble_ = NULL;
 
@@ skipping 81 matching lines @@
   SchedulePaint();
 }
 
 void SystemTray::OnWidgetClosing(views::Widget* widget) {
   CHECK_EQ(popup_, widget);
   popup_ = NULL;
   bubble_ = NULL;
 }
 
 }  // namespace ash