Update CrOS to use scoped_refptr<T>::get() rather than implicit "operator T*"

chrome/browser/chromeos/kiosk_mode/kiosk_mode_screensaver.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 "chrome/browser/chromeos/kiosk_mode/kiosk_mode_screensaver.h"
 
 #include "ash/screensaver/screensaver_view.h"
 #include "ash/shell.h"
 #include "ash/wm/user_activity_detector.h"
 #include "base/bind.h"
@@ skipping 173 matching lines @@
   base::FilePath extensions_dir = extensions::ExtensionSystem::Get(
       default_profile)->extension_service()->install_directory();
   scoped_refptr<SandboxedUnpacker> screensaver_unpacker(
       new SandboxedUnpacker(
           screensaver_crx,
           true,
           extensions::Manifest::COMPONENT,
           Extension::NO_FLAGS,
           extensions_dir,
           content::BrowserThread::GetMessageLoopProxyForThread(
-              content::BrowserThread::FILE),
+              content::BrowserThread::FILE).get(),
           new ScreensaverUnpackerClient(
               screensaver_crx,
               base::Bind(
                   &KioskModeScreensaver::SetupScreensaver,
                   weak_ptr_factory_.GetWeakPtr()))));
 
   // Fire off the unpacker on the file thread; don't need it to return.
   content::BrowserThread::PostTask(
       content::BrowserThread::FILE,
       FROM_HERE,
@@ skipping 69 matching lines @@
 
   g_kiosk_mode_screensaver = new KioskModeScreensaver();
 }
 
 void ShutdownKioskModeScreensaver() {
   delete g_kiosk_mode_screensaver;
   g_kiosk_mode_screensaver = NULL;
 }
 
 }  // namespace chromeos