[Sync] Move //components/sync to the syncer namespace.

components/sync/api/model_type_store.cc

 // Copyright 2015 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 "components/sync/api/model_type_store.h"
 
 #include "components/sync/core/model_type_store_impl.h"
 
-namespace syncer_v2 {
+namespace syncer {
 
 // static
 void ModelTypeStore::CreateInMemoryStoreForTest(const InitCallback& callback) {
   ModelTypeStoreImpl::CreateInMemoryStoreForTest(callback);
 }
 
 // static
 void ModelTypeStore::CreateStore(
-    const syncer::ModelType type,
+    const ModelType type,
     const std::string& path,
     scoped_refptr<base::SequencedTaskRunner> blocking_task_runner,
     const InitCallback& callback) {
   ModelTypeStoreImpl::CreateStore(type, path, blocking_task_runner, callback);
 }
 
 ModelTypeStore::~ModelTypeStore() {}
 
 ModelTypeStore::WriteBatch::WriteBatch() {}
 
 ModelTypeStore::WriteBatch::~WriteBatch() {}
 
-}  // namespace syncer_v2
+}  // namespace syncer