move V2 classes in chrome/engine to syncer_v2 namespace

components/sync_driver/non_blocking_data_type_manager.h

Index: components/sync_driver/non_blocking_data_type_manager.h
diff --git a/components/sync_driver/non_blocking_data_type_manager.h b/components/sync_driver/non_blocking_data_type_manager.h
index 575241293a80b52ea05978e69fd43be46b813d1b..acd6e5f30aa958c6d53000197305f08266b35384 100644
--- a/components/sync_driver/non_blocking_data_type_manager.h
+++ b/components/sync_driver/non_blocking_data_type_manager.h
@@ -15,11 +15,8 @@ namespace base {
 class SequencedTaskRunner;
 }  // namespace base
 
-namespace syncer {
-class ModelTypeSyncProxyImpl;
-}  //namespace syncer
-
 namespace syncer_v2 {
+class ModelTypeSyncProxyImpl;
 class SyncContextProxy;
 }  // namespace syncer_v2
 
@@ -48,7 +45,7 @@ class NonBlockingDataTypeManager {
   void InitializeType(
       syncer::ModelType type,
       const scoped_refptr<base::SequencedTaskRunner>& task_runner,
-      const base::WeakPtr<syncer::ModelTypeSyncProxyImpl>& type_sync_proxy);
+      const base::WeakPtr<syncer_v2::ModelTypeSyncProxyImpl>& type_sync_proxy);
 
   // Connects the sync backend, as represented by a SyncContextProxy, to the
   // NonBlockingDataTypeController on the UI thread.