Bug 1851997 - Port bug 1851797 to Thunderbird - Remove nsIScriptableUnicodeConverter convertToByteArray and convertToInputStream. r=freaktechnik

Differential Revision: https://phabricator.services.mozilla.com/D187669

--HG--
extra : rebase_source : 964648218784556858d0460d36c6c992b0aff1e8
extra : amend_source : 24bfea2c2574b730f7c5d2000e01c79fb7253a51

chat/modules/socket.sys.mjs

@@ -250,8 +250,9 @@ export var Socket = {
     let converter = new ScriptableUnicodeConverter();
     converter.charset = aEncoding;
     try {
-      let stream = converter.convertToInputStream(aString);
-      this._outputStream.writeFrom(stream, stream.available());
+      let buf = converter.ConvertFromUnicode(aString);
+      buf += converter.Finish();
+      this._outputStream.write(buf, buf.length);
     } catch (e) {
       console.error(e);
     }