[Sync] ModelTypeStore::ReadMetadataCallback now returns a MetadataBatch

components/sync/device_info/device_info_sync_bridge.h

Index: components/sync/device_info/device_info_sync_bridge.h
diff --git a/components/sync/device_info/device_info_sync_bridge.h b/components/sync/device_info/device_info_sync_bridge.h
index 35701b7b609603096b83c531452651564551c81c..2cfa1e5a9906cce7b5de464fb5e2d054ebd6e244 100644
--- a/components/sync/device_info/device_info_sync_bridge.h
+++ b/components/sync/device_info/device_info_sync_bridge.h
@@ -92,10 +92,8 @@ class DeviceInfoSyncBridge : public ModelTypeSyncBridge,
                       std::unique_ptr<ModelTypeStore> store);
   void OnReadAllData(ModelTypeStore::Result result,
                      std::unique_ptr<ModelTypeStore::RecordList> record_list);
-  void OnReadAllMetadata(
-      ModelTypeStore::Result result,
-      std::unique_ptr<ModelTypeStore::RecordList> metadata_records,
-      const std::string& global_metadata);
+  void OnReadAllMetadata(SyncError error,
+                         std::unique_ptr<MetadataBatch> metadata_batch);
   void OnCommit(ModelTypeStore::Result result);
 
   // Load metadata if the data is loaded and the provider is initialized.