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

components/sync/api/metadata_change_list.h

Index: components/sync/api/metadata_change_list.h
diff --git a/components/sync/api/metadata_change_list.h b/components/sync/api/metadata_change_list.h
index b79c419ae84bb6f86cb6e7db117425db09318997..f359b60ce111aab0e1dde5f877a88fa3589c995a 100644
--- a/components/sync/api/metadata_change_list.h
+++ b/components/sync/api/metadata_change_list.h
@@ -12,7 +12,7 @@ class DataTypeState;
 class EntityMetadata;
 }  // namespace sync_pb
 
-namespace syncer_v2 {
+namespace syncer {
 
 // Interface used by the processor and service to communicate about metadata.
 // The purpose of the interface is to record changes to data type global and
@@ -45,6 +45,6 @@ class MetadataChangeList {
   virtual void ClearMetadata(const std::string& storage_key) = 0;
 };
 
-}  // namespace syncer_v2
+}  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_API_METADATA_CHANGE_LIST_H_