[Sync] Rename DataTypeState to ModelTypeState.

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 f359b60ce111aab0e1dde5f877a88fa3589c995a..c20b7b9e6957a1a4a6fd32edd0d2a0d1a5ef7fbf 100644
--- a/components/sync/api/metadata_change_list.h
+++ b/components/sync/api/metadata_change_list.h
@@ -8,8 +8,8 @@
 #include <string>
 
 namespace sync_pb {
-class DataTypeState;
 class EntityMetadata;
+class ModelTypeState;
 }  // namespace sync_pb
 
 namespace syncer {
@@ -27,12 +27,12 @@ class MetadataChangeList {
   MetadataChangeList() {}
   virtual ~MetadataChangeList() {}
 
-  // Requests DataTypeState to be updated in the storage.
-  virtual void UpdateDataTypeState(
-      const sync_pb::DataTypeState& data_type_state) = 0;
+  // Requests ModelTypeState to be updated in the storage.
+  virtual void UpdateModelTypeState(
+      const sync_pb::ModelTypeState& model_type_state) = 0;
 
-  // Requests DataTypeState to be cleared from the storage.
-  virtual void ClearDataTypeState() = 0;
+  // Requests ModelTypeState to be cleared from the storage.
+  virtual void ClearModelTypeState() = 0;
 
   // Requests metadata entry to be updated in the storage.
   // Please note that the update might contain a deleted entry if