[components] Switch {RefCounted}ProfileKeyedService to use BrowserContext

chrome/browser/signin/signin_manager_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/signin_manager_factory.h"
 
 #include "base/prefs/pref_registry_simple.h"
 #include "chrome/browser/profiles/profile_dependency_manager.h"
 #include "chrome/browser/signin/signin_manager.h"
 #include "chrome/browser/signin/token_service_factory.h"
@@ skipping 60 matching lines @@
                              PrefRegistrySyncable::UNSYNCABLE_PREF);
 }
 
 // static
 void SigninManagerFactory::RegisterPrefs(PrefRegistrySimple* registry) {
   registry->RegisterStringPref(prefs::kGoogleServicesUsernamePattern,
                                std::string());
 }
 
 ProfileKeyedService* SigninManagerFactory::BuildServiceInstanceFor(
-    Profile* profile) const {
-
+    content::BrowserContext* profile) const {
   SigninManagerBase* service = NULL;
 #if defined(OS_CHROMEOS)
   service = new SigninManagerBase();
 #else
   service = new SigninManager();
 #endif
-
-  service->Initialize(profile);
+  service->Initialize(static_cast<Profile*>(profile));
   return service;
 }