[components] Switch {RefCounted}ProfileKeyedService to use BrowserContext

chrome/browser/policy/cloud/user_policy_signin_service_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/policy/cloud/user_policy_signin_service_factory.h"
 
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/policy/cloud/user_cloud_policy_manager_factory.h"
 #include "chrome/browser/policy/cloud/user_policy_signin_service.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 21 matching lines @@
   return static_cast<UserPolicySigninService*>(
       GetInstance()->GetServiceForProfile(profile, true));
 }
 
 // static
 UserPolicySigninServiceFactory* UserPolicySigninServiceFactory::GetInstance() {
   return Singleton<UserPolicySigninServiceFactory>::get();
 }
 
 ProfileKeyedService* UserPolicySigninServiceFactory::BuildServiceInstanceFor(
-    Profile* profile) const {
-  return new UserPolicySigninService(profile);
+    content::BrowserContext* profile) const {
+  return new UserPolicySigninService(static_cast<Profile*>(profile));
 }
 
 bool UserPolicySigninServiceFactory::ServiceIsCreatedWithProfile() const {
   // Create this object when the profile is created so it can track any
   // user signin activity.
   return true;
 }
 
 void UserPolicySigninServiceFactory::RegisterUserPrefs(
     PrefRegistrySyncable* user_prefs) {
   user_prefs->RegisterBooleanPref(prefs::kDisableCloudPolicyOnSignin,
                                   false, PrefRegistrySyncable::UNSYNCABLE_PREF);
 }
 
 }  // namespace policy