keep RDFDataSource.saveToFile around

minimizes the diff we need to keep. note that as previously mentioned
this requires mozilla>=85, but shouldn't cause issues unless called.

This partially reverts commit 553416c2d6d3c760cf98bd2c4afbaf0442321951.

1 files changed, 7 insertions, 0 deletions

diff --git a/legacy/RDFDataSource.jsm b/legacy/RDFDataSource.jsm
index f285013..579d075 100644
--- a/legacy/RDFDataSource.jsm
+++ b/legacy/RDFDataSource.jsm
@@ -1507,4 +1507,11 @@ class RDFDataSource {
     var serializer = new XMLSerializer();
     return serializer.serializeToString(this._document);
   }
+
+  /**
+   * Saves the RDF/XML to a file.
+   */
+  async saveToFile(file) {
+    return IOUtils.writeUTF8(file, this.serializeToString());
+  }
 }