[Sync] Move //components/sync to the syncer namespace, take 2.

components/sync/core/data_batch_impl.h

Index: components/sync/core/data_batch_impl.h
diff --git a/components/sync/core/data_batch_impl.h b/components/sync/core/data_batch_impl.h
index 918416da10ddc2e1d2a44b627cc80b52c85c2af8..da27b64b1f973ffded17a28df35aff82a1d04edc 100644
--- a/components/sync/core/data_batch_impl.h
+++ b/components/sync/core/data_batch_impl.h
@@ -16,7 +16,7 @@
 #include "components/sync/api/data_batch.h"
 #include "components/sync/api/entity_data.h"
 
-namespace syncer_v2 {
+namespace syncer {
 
 // An implementation of DataBatch that's purpose is to transfer ownership of
 // EntityData objects. As soon as this batch recieves the EntityData, it owns
@@ -45,6 +45,6 @@ class DataBatchImpl : public DataBatch {
   DISALLOW_COPY_AND_ASSIGN(DataBatchImpl);
 };
 
-}  // namespace syncer_v2
+}  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_CORE_DATA_BATCH_IMPL_H_