sync: Make ProfileSyncService a ProfileKeyedService.

chrome/browser/sync/profile_sync_service_factory.h

+// 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.
+
+#ifndef CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_FACTORY_H_
+#define CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_FACTORY_H_
+
+#include "base/compiler_specific.h"
+#include "base/memory/singleton.h"
+#include "chrome/browser/profiles/profile_keyed_service_factory.h"
+
+class Profile;
+class ProfileSyncService;
+
+class ProfileSyncServiceFactory : public ProfileKeyedServiceFactory {
+ public:
+  static ProfileSyncService* GetForProfile(Profile* profile);
+  static bool HasProfileSyncService(Profile* profile);
+
+  static ProfileSyncServiceFactory* GetInstance();
+
+ private:
+  friend struct DefaultSingletonTraits<ProfileSyncServiceFactory>;
+
+  ProfileSyncServiceFactory();
+  virtual ~ProfileSyncServiceFactory();
+
+  // ProfileKeyedServiceFactory:
+  virtual ProfileKeyedService* BuildServiceInstanceFor(
+      Profile* profile) const OVERRIDE;
+};
+
+#endif  // CHROME_BROWSER_SYNC_PROFILE_SYNC_SERVICE_FACTORY_H_