Convert Pass()→std::move() in //chrome

chrome/browser/profile_resetter/resettable_settings_snapshot.cc

 // Copyright (c) 2013 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/profile_resetter/resettable_settings_snapshot.h"
 
 #include "base/guid.h"
 #include "base/json/json_writer.h"
 #include "base/md5.h"
 #include "base/prefs/pref_service.h"
@@ skipping 410 matching lines @@
        extensions.begin(); i != extensions.end(); ++i) {
     if (!extension_names.empty())
       extension_names += '\n';
     extension_names += i->second;
   }
   if (!extension_names.empty()) {
     AddPair(list.get(),
             l10n_util::GetStringUTF16(IDS_RESET_PROFILE_SETTINGS_EXTENSIONS),
             extension_names);
   }
-  return list.Pass();
+  return list;
 }