move V2 classes in chrome/engine to syncer_v2 namespace

sync/internal_api/public/test/null_sync_context_proxy.h

 // 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.
 
 #ifndef SYNC_INTERNAL_API_PUBLIC_TEST_NULL_SYNC_CONTEXT_PROXY_H_
 #define SYNC_INTERNAL_API_PUBLIC_TEST_NULL_SYNC_CONTEXT_PROXY_H_
 
 #include "base/memory/weak_ptr.h"
 #include "sync/internal_api/public/non_blocking_sync_common.h"
 #include "sync/internal_api/public/sync_context_proxy.h"
 
-namespace syncer {
+namespace syncer_v2 {
 class ModelTypeSyncProxyImpl;
-}
 
-namespace syncer_v2 {
 // A non-functional implementation of SyncContextProxy.
 //
 // It supports Clone(), but not much else.  Useful for testing.
 class NullSyncContextProxy : public SyncContextProxy {
  public:
   NullSyncContextProxy();
   ~NullSyncContextProxy() override;
 
-  void ConnectTypeToSync(syncer::ModelType type,
-                         const DataTypeState& data_type_state,
-                         const UpdateResponseDataList& saved_pending_updates,
-                         const base::WeakPtr<syncer::ModelTypeSyncProxyImpl>&
-                             type_sync_proxy) override;
+  void ConnectTypeToSync(
+      syncer::ModelType type,
+      const DataTypeState& data_type_state,
+      const UpdateResponseDataList& saved_pending_updates,
+      const base::WeakPtr<ModelTypeSyncProxyImpl>& type_sync_proxy) override;
   void Disconnect(syncer::ModelType type) override;
   scoped_ptr<SyncContextProxy> Clone() const override;
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_TEST_NULL_SYNC_CONTEXT_PROXY_H_