Add RetainedRef uses where needed.

chrome/browser/extensions/extension_system_impl.cc

 // Copyright 2014 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/extensions/extension_system_impl.h"
 
 #include "base/base_switches.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
@@ skipping 389 matching lines @@
 
   NotifierStateTracker* notifier_state_tracker =
       NotifierStateTrackerFactory::GetForProfile(profile_);
   notifications_disabled =
       !notifier_state_tracker->IsNotifierEnabled(notifier_id);
 #endif
 
   BrowserThread::PostTaskAndReply(
       BrowserThread::IO, FROM_HERE,
       base::Bind(&InfoMap::AddExtension, info_map(),
-                 make_scoped_refptr(extension), install_time, incognito_enabled,
+                 base::RetainedRef(extension), install_time, incognito_enabled,
                  notifications_disabled),
       callback);
 }
 
 void ExtensionSystemImpl::UnregisterExtensionWithRequestContexts(
     const std::string& extension_id,
     const UnloadedExtensionInfo::Reason reason) {
   BrowserThread::PostTask(
       BrowserThread::IO,
       FROM_HERE,
       base::Bind(&InfoMap::RemoveExtension, info_map(), extension_id, reason));
 }
 
 }  // namespace extensions