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

components/sync/api/data_batch.h

Index: components/sync/api/data_batch.h
diff --git a/components/sync/api/data_batch.h b/components/sync/api/data_batch.h
index 43eb187759b94233636ff316af47570aec598037..b8d486f953a4f0d7e0f3b53aea03819f11a7d8fc 100644
--- a/components/sync/api/data_batch.h
+++ b/components/sync/api/data_batch.h
@@ -12,7 +12,7 @@
 
 #include "components/sync/api/entity_data.h"
 
-namespace syncer_v2 {
+namespace syncer {
 
 typedef std::pair<std::string, std::unique_ptr<EntityData>> KeyAndData;
 
@@ -31,6 +31,6 @@ class DataBatch {
   virtual KeyAndData Next() = 0;
 };
 
-}  // namespace syncer_v2
+}  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_API_DATA_BATCH_H_