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

components/sync/core/simple_metadata_change_list.h

Index: components/sync/core/simple_metadata_change_list.h
diff --git a/components/sync/core/simple_metadata_change_list.h b/components/sync/core/simple_metadata_change_list.h
index f04562af0445c26ae8a81f6e5cde3023d99081fa..de39091d5895e4a1fd1d50abf5e9fbbccec7c039 100644
--- a/components/sync/core/simple_metadata_change_list.h
+++ b/components/sync/core/simple_metadata_change_list.h
@@ -14,7 +14,7 @@
 #include "components/sync/protocol/data_type_state.pb.h"
 #include "components/sync/protocol/entity_metadata.pb.h"
 
-namespace syncer_v2 {
+namespace syncer {
 
 // A MetadataChangeList implementation that is meant to be used in combination
 // with a ModelTypeStore. It accumulates changes in member fields, and then when
@@ -60,6 +60,6 @@ class SimpleMetadataChangeList : public MetadataChangeList {
   std::unique_ptr<DataTypeStateChange> state_change_;
 };
 
-}  // namespace syncer_v2
+}  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_CORE_SIMPLE_METADATA_CHANGE_LIST_H_