Replace 'Scanning' text in Network Status Area with throbber

ash/system/bluetooth/tray_bluetooth.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/bluetooth/tray_bluetooth.h"
 
 #include "ash/session/session_state_delegate.h"
 #include "ash/shell.h"
 #include "ash/system/tray/fixed_sized_scroll_view.h"
 #include "ash/system/tray/hover_highlight_view.h"
@@ skipping 182 matching lines @@
 
   void AppendHeaderEntry() {
     CreateSpecialRow(IDS_ASH_STATUS_TRAY_BLUETOOTH, this);
 
     if (login_ == user::LOGGED_IN_LOCKED)
       return;
 
     throbber_ = new ThrobberView;
     throbber_->SetTooltipText(
         l10n_util::GetStringUTF16(IDS_ASH_STATUS_TRAY_BLUETOOTH_DISCOVERING));
-    footer()->AddThrobber(throbber_);
+    footer()->AddView(throbber_, false /* separator */);
 
     // Do not allow toggling bluetooth in the lock screen.
     ash::SystemTrayDelegate* delegate =
         ash::Shell::GetInstance()->system_tray_delegate();
     toggle_bluetooth_ = new TrayPopupHeaderButton(this,
         IDR_AURA_UBER_TRAY_BLUETOOTH_ENABLED,
         IDR_AURA_UBER_TRAY_BLUETOOTH_DISABLED,
         IDR_AURA_UBER_TRAY_BLUETOOTH_ENABLED_HOVER,
         IDR_AURA_UBER_TRAY_BLUETOOTH_DISABLED_HOVER,
         IDS_ASH_STATUS_TRAY_BLUETOOTH);
@@ skipping 249 matching lines @@
     detailed_->Update();
 }
 
 void TrayBluetooth::OnBluetoothDiscoveringChanged() {
   if (!detailed_)
     return;
   detailed_->Update();
 }
 
 }  // namespace ash