[Sync] Refactor sync manager into interface.

sync/internal_api/sync_manager_factory.cc

Index: sync/internal_api/sync_manager_factory.cc
diff --git a/sync/internal_api/sync_manager_factory.cc b/sync/internal_api/sync_manager_factory.cc
new file mode 100644
index 0000000000000000000000000000000000000000..9d784b46ada76cb50d03ace2cf040cdd00a14f2e
--- /dev/null
+++ b/sync/internal_api/sync_manager_factory.cc
@@ -0,0 +1,22 @@
+// 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 "sync/internal_api/public/sync_manager_factory.h"
+
+#include "sync/internal_api/sync_manager_impl.h"
+
+namespace syncer {
+
+SyncManagerFactory::SyncManagerFactory() {
+}
+
+SyncManagerFactory::~SyncManagerFactory() {
+}
+
+scoped_ptr<SyncManager> SyncManagerFactory::CreateSyncManager(
+      const std::string name) {
+  return scoped_ptr<SyncManager>(new SyncManagerImpl(name));
+}
+
+}  // namespace syncer