Introduce //components/user_prefs, use to eliminate c/b/prefs dependency in Autofill.

chrome/browser/signin/about_signin_internals_factory.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/signin/about_signin_internals_factory.h"
 
 #include "base/prefs/pref_service.h"
-#include "chrome/browser/prefs/pref_registry_syncable.h"
 #include "chrome/browser/profiles/profile_dependency_manager.h"
 #include "chrome/browser/signin/about_signin_internals.h"
 #include "chrome/browser/signin/signin_internals_util.h"
 #include "chrome/browser/signin/token_service_factory.h"
 #include "chrome/common/pref_names.h"
+#include "components/user_prefs/pref_registry_syncable.h"
 #include "google_apis/gaia/gaia_constants.h"
 
 using namespace signin_internals_util;
 
 AboutSigninInternalsFactory::AboutSigninInternalsFactory()
     : ProfileKeyedServiceFactory("AboutSigninInternals",
                                  ProfileDependencyManager::GetInstance()) {
   DependsOn(SigninManagerFactory::GetInstance());
   DependsOn(TokenServiceFactory::GetInstance());
 }
@@ skipping 45 matching lines @@
                                    PrefRegistrySyncable::UNSYNCABLE_PREF);
   }
 }
 
 ProfileKeyedService* AboutSigninInternalsFactory::BuildServiceInstanceFor(
     Profile* profile) const {
   AboutSigninInternals* service = new AboutSigninInternals();
   service->Initialize(profile);
   return service;
 }