[components] Switch {RefCounted}ProfileKeyedService to use BrowserContext

chrome/browser/ui/webui/signin/login_ui_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/ui/webui/signin/login_ui_service_factory.h"
 
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile_dependency_manager.h"
 #include "chrome/browser/signin/signin_manager.h"
 #include "chrome/browser/ui/webui/signin/login_ui_service.h"
@@ skipping 11 matching lines @@
   return static_cast<LoginUIService*>(
       GetInstance()->GetServiceForProfile(profile, true));
 }
 
 // static
 LoginUIServiceFactory* LoginUIServiceFactory::GetInstance() {
   return Singleton<LoginUIServiceFactory>::get();
 }
 
 ProfileKeyedService* LoginUIServiceFactory::BuildServiceInstanceFor(
-    Profile* profile) const {
-  return new LoginUIService(profile);
+    content::BrowserContext* profile) const {
+  return new LoginUIService(static_cast<Profile*>(profile));
 }