move V2 classes in chrome/engine to syncer_v2 namespace

sync/internal_api/public/test/null_sync_context_proxy.h

Index: sync/internal_api/public/test/null_sync_context_proxy.h
diff --git a/sync/internal_api/public/test/null_sync_context_proxy.h b/sync/internal_api/public/test/null_sync_context_proxy.h
index c6546193b385cc5960bb5a1e70cacb910ad820fc..cc4573833a69d8adc4f29ad9f4cc98f844233dcd 100644
--- a/sync/internal_api/public/test/null_sync_context_proxy.h
+++ b/sync/internal_api/public/test/null_sync_context_proxy.h
@@ -9,11 +9,9 @@
 #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.
@@ -22,11 +20,11 @@ class NullSyncContextProxy : public SyncContextProxy {
   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;
 };