[Sync] Cleanup datatype configuration error handling.

components/sync_driver/failed_data_types_handler.h

Index: components/sync_driver/failed_data_types_handler.h
diff --git a/components/sync_driver/failed_data_types_handler.h b/components/sync_driver/failed_data_types_handler.h
index 93b6fae6ac6eb0532f4291fecc0516a6fe6c2fe0..985e75923dfb9dc22141e2581711a7c2d68f0906 100644
--- a/components/sync_driver/failed_data_types_handler.h
+++ b/components/sync_driver/failed_data_types_handler.h
@@ -61,12 +61,18 @@ class FailedDataTypesHandler {
   // Returns the types that cannot be configured due to not being ready.
   syncer::ModelTypeSet GetUnreadyErrorTypes() const;
 
+  // Returns the types that triggered the unrecoverable error.
+  syncer::ModelTypeSet GetUnrecoverableErrorTypes() const;
+
+  // Returns the current unrecoverable error, if there is one.
+  syncer::SyncError GetUnrecoverableError() const;
+
  private:
   // Returns true if there are any types with errors.
   bool AnyFailedDataType() const;
 
-  // List of data types that failed due to unrecoverable errors and should
-  // be disabled.
+  // The current unrecoverable errors. Only one unrecoverable error can be
+  // active at a time, but it may apply to more than one type.
   TypeErrorMap unrecoverable_errors_;
 
   // List of data types that failed due to runtime errors and should be