Remove enable Drive offline system tray UI.

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/ash_switches.h"
 #include "ash/shelf/shelf_layout_manager.h"
 #include "ash/shell.h"
 #include "ash/shell/panel_window.h"
@@ skipping 31 matching lines @@
 #include "ui/gfx/skia_util.h"
 #include "ui/views/border.h"
 #include "ui/views/controls/label.h"
 #include "ui/views/layout/box_layout.h"
 #include "ui/views/layout/fill_layout.h"
 #include "ui/views/view.h"
 
 #if defined(OS_CHROMEOS)
 #include "ash/system/chromeos/audio/tray_audio.h"
 #include "ash/system/chromeos/brightness/tray_brightness.h"
-#include "ash/system/chromeos/drive/tray_drive_notice.h"
 #include "ash/system/chromeos/enterprise/tray_enterprise.h"
 #include "ash/system/chromeos/managed/tray_locally_managed_user.h"
 #include "ash/system/chromeos/network/tray_network.h"
 #include "ash/system/chromeos/network/tray_sms.h"
 #include "ash/system/chromeos/network/tray_vpn.h"
 #include "ash/system/chromeos/power/tray_power.h"
 #include "ash/system/chromeos/screen_security/screen_capture_tray_item.h"
 #include "ash/system/chromeos/screen_security/screen_share_tray_item.h"
 #include "ash/system/chromeos/settings/tray_settings.h"
 #include "ash/system/chromeos/tray_display.h"
@@ skipping 112 matching lines @@
     // menu if more then one user is logged in.
     AddTrayItem(new internal::TrayUserSeparator(this));
   }
 #endif
 
   tray_accessibility_ = new internal::TrayAccessibility(this);
   tray_date_ = new internal::TrayDate(this);
 
 #if defined(OS_CHROMEOS)
   AddTrayItem(new internal::TrayEnterprise(this));
-  AddTrayItem(new internal::TrayDriveNotice(this));
   AddTrayItem(new internal::TrayLocallyManagedUser(this));
   AddTrayItem(new internal::TrayIME(this));
   AddTrayItem(tray_accessibility_);
   AddTrayItem(new internal::TrayTracing(this));
   AddTrayItem(
       new internal::TrayPower(this, message_center::MessageCenter::Get()));
   AddTrayItem(new internal::TrayNetwork(this));
   AddTrayItem(new internal::TrayVPN(this));
   AddTrayItem(new internal::TraySms(this));
   AddTrayItem(new internal::TrayBluetooth(this));
@@ skipping 523 matching lines @@
   system_bubble_.reset();
   // When closing a system bubble with the alternate shelf layout, we need to
   // turn off the active tinting of the shelf.
   if (full_system_tray_menu_) {
     SetDrawBackgroundAsActive(false);
     full_system_tray_menu_ = false;
   }
 }
 
 }  // namespace ash