Use MetadataChangeList and EntityChangeList in SharedModelTypeProcessor

sync/internal_api/public/simple_metadata_change_list.h

Index: sync/internal_api/public/simple_metadata_change_list.h
diff --git a/sync/internal_api/public/simple_metadata_change_list.h b/sync/internal_api/public/simple_metadata_change_list.h
index 12bbe59c92c0e62ddc115961675837b296ff13d8..aca0e69e0bcd108d2424003f6dfb1c95fa2c03dc 100644
--- a/sync/internal_api/public/simple_metadata_change_list.h
+++ b/sync/internal_api/public/simple_metadata_change_list.h
@@ -19,6 +19,12 @@ class SYNC_EXPORT SimpleMetadataChangeList : public MetadataChangeList {
   SimpleMetadataChangeList();
   ~SimpleMetadataChangeList() override;
 
+  void UpdateDataTypeState(const DataTypeState& data_type_state) override;
+  void ClearDataTypeState() override;
+  void UpdateMetadata(const std::string& client_tag,
+                      const sync_pb::EntityMetadata& metadata) override;
+  void ClearMetadata(const std::string& client_tag) override;
+
   // Moves all currently accumulated changes into the write batch, clear out
   // local copies. Calling this multiple times will work, but should not be
   // necessary.