[components] Switch {RefCounted}ProfileKeyedService to use BrowserContext

chrome/browser/search/instant_service_factory.cc

 // Copyright 2013 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/search/instant_service_factory.h"
 
+#include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_dependency_manager.h"
 #include "chrome/browser/search/instant_service.h"
 
 // static
 InstantService* InstantServiceFactory::GetForProfile(Profile* profile) {
   return static_cast<InstantService*>(
       GetInstance()->GetServiceForProfile(profile, true));
 }
 
 // static
 InstantServiceFactory* InstantServiceFactory::GetInstance() {
   return Singleton<InstantServiceFactory>::get();
 }
 
 InstantServiceFactory::InstantServiceFactory()
     : ProfileKeyedServiceFactory("InstantService",
                                  ProfileDependencyManager::GetInstance()) {
   // No dependencies.
 }
 
 InstantServiceFactory::~InstantServiceFactory() {
 }
 
 bool InstantServiceFactory::ServiceHasOwnInstanceInIncognito() const {
   return true;
 }
 
 ProfileKeyedService* InstantServiceFactory::BuildServiceInstanceFor(
-    Profile* profile) const {
-  return new InstantService(profile);
+    content::BrowserContext* profile) const {
+  return new InstantService(static_cast<Profile*>(profile));
 }