Convert Pass()→std::move() for iOS build.

ios/chrome/browser/signin/about_signin_internals_factory.cc

 // Copyright 2015 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 "ios/chrome/browser/signin/about_signin_internals_factory.h"
 
+#include <utility>
+
 #include "base/memory/singleton.h"
 #include "components/keyed_service/ios/browser_state_dependency_manager.h"
 #include "components/signin/core/browser/about_signin_internals.h"
 #include "ios/chrome/browser/signin/account_tracker_service_factory.h"
 #include "ios/chrome/browser/signin/gaia_cookie_manager_service_factory.h"
 #include "ios/chrome/browser/signin/oauth2_token_service_factory.h"
 #include "ios/chrome/browser/signin/signin_client_factory.h"
 #include "ios/chrome/browser/signin/signin_error_controller_factory.h"
 #include "ios/chrome/browser/signin/signin_manager_factory.h"
 #include "ios/public/provider/chrome/browser/browser_state/chrome_browser_state.h"
@@ skipping 32 matching lines @@
       ios::ChromeBrowserState::FromBrowserState(context);
   scoped_ptr<AboutSigninInternals> service(new AboutSigninInternals(
       OAuth2TokenServiceFactory::GetForBrowserState(chrome_browser_state),
       AccountTrackerServiceFactory::GetForBrowserState(chrome_browser_state),
       SigninManagerFactory::GetForBrowserState(chrome_browser_state),
       SigninErrorControllerFactory::GetForBrowserState(chrome_browser_state),
       GaiaCookieManagerServiceFactory::GetForBrowserState(
           chrome_browser_state)));
   service->Initialize(
       SigninClientFactory::GetForBrowserState(chrome_browser_state));
-  return service.Pass();
+  return std::move(service);
 }
 
 void AboutSigninInternalsFactory::RegisterBrowserStatePrefs(
     user_prefs::PrefRegistrySyncable* user_prefs) {
   AboutSigninInternals::RegisterPrefs(user_prefs);
 }
 
 }  // namespace ios