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

chrome/browser/chromeos/screensaver/screensaver_controller.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/screensaver/screensaver_controller.h"
 
 #include "ash/screensaver/screensaver_view.h"
 #include "ash/shell.h"
 #include "ash/wm/user_activity_detector.h"
 #include "base/bind.h"
@@ skipping 27 matching lines @@
 // the one with exclude_id.
 std::string FindScreensaverExtension(ExtensionService* service,
                                      const std::string& exclude_id) {
   const ExtensionSet* extensions = service->extensions();
   if (!extensions)
     return std::string();
 
   for (ExtensionSet::const_iterator it = extensions->begin();
       it != extensions->end();
       ++it) {
-    const extensions::Extension* extension = *it;
+    const extensions::Extension* extension = it->get();
     if (extension &&
         extension->id() != exclude_id &&
         extension->HasAPIPermission(extensions::APIPermission::kScreensaver)) {
       return extension->id();
     }
   }
 
   return std::string();
 }
 
@@ skipping 119 matching lines @@
   ash::CloseScreensaver();
   screensaver_extension_id_ = "";
 }
 
 void ScreensaverController::RequestNextIdleNotification() {
   DBusThreadManager::Get()->GetPowerManagerClient()->
       RequestIdleNotification(threshold_.InMilliseconds());
 }
 
 }  // namespace chromeos