move V2 classes in chrome/engine to syncer_v2 namespace

sync/internal_api/test/null_sync_context_proxy.cc

 // Copyright 2014 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/test/null_sync_context_proxy.h"
 
 namespace syncer_v2 {
 
 NullSyncContextProxy::NullSyncContextProxy() {
 }
 
 NullSyncContextProxy::~NullSyncContextProxy() {
 }
 
 void NullSyncContextProxy::ConnectTypeToSync(
     syncer::ModelType type,
     const DataTypeState& data_type_state,
     const UpdateResponseDataList& saved_pending_updates,
-    const base::WeakPtr<syncer::ModelTypeSyncProxyImpl>& type_sync_proxy) {
+    const base::WeakPtr<ModelTypeSyncProxyImpl>& type_sync_proxy) {
   NOTREACHED() << "NullSyncContextProxy is not meant to be used";
 }
 
 void NullSyncContextProxy::Disconnect(syncer::ModelType type) {
   NOTREACHED() << "NullSyncContextProxy is not meant to be used";
 }
 
 scoped_ptr<SyncContextProxy> NullSyncContextProxy::Clone() const {
   return scoped_ptr<SyncContextProxy>(new NullSyncContextProxy());
 }
 
 }  // namespace syncer