Bug 1477017 [wpt PR 12068] - Update wpt metadata, a=testonly

wpt-pr: 12068
wpt-type: metadata

testing/web-platform/meta/html/dom/interfaces.https.html.ini

@@ -1410,3 +1410,6 @@
   [MessageEvent interface: new MessageEvent("message", { data: 5 }) must inherit property "source" with the proper type]
     expected: FAIL
 
+  [TextMetrics interface: operation getBaselines()]
+    expected: FAIL
+