[components] Switch {RefCounted}ProfileKeyedService to use BrowserContext

chrome/browser/download/download_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/download/download_service_factory.h"
 
 #include "chrome/browser/download/download_service.h"
 #include "chrome/browser/history/history_service_factory.h"
 #include "chrome/browser/profiles/profile_dependency_manager.h"
 
@@ skipping 12 matching lines @@
 DownloadServiceFactory::DownloadServiceFactory()
     : ProfileKeyedServiceFactory("DownloadService",
                                  ProfileDependencyManager::GetInstance()) {
   DependsOn(HistoryServiceFactory::GetInstance());
 }
 
 DownloadServiceFactory::~DownloadServiceFactory() {
 }
 
 ProfileKeyedService* DownloadServiceFactory::BuildServiceInstanceFor(
-    Profile* profile) const {
-  DownloadService* service = new DownloadService(profile);
+    content::BrowserContext* profile) const {
+  DownloadService* service =
+      new DownloadService(static_cast<Profile*>(profile));
 
   // No need for initialization; initialization can be done on first
   // use of service.
 
   return service;
 }
 
 bool DownloadServiceFactory::ServiceHasOwnInstanceInIncognito() const {
   return true;
 }