Bug 1490056 [wpt PR 12932] - Update wpt metadata, a=testonly

wpt-pr: 12932 wpt-type: metadata
2018-09-10 21:46:46 +00:00 · 2018-09-10 21:46:46 +00:00 · a5ee3a06dc
--- a/testing/web-platform/meta/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/legend-display-rendering.html.ini
+++ b/testing/web-platform/meta/html/rendering/non-replaced-elements/the-fieldset-and-legend-elements/legend-display-rendering.html.ini
@ -0,0 +1,2 @@
+[legend-display-rendering.html]
+  expected: FAIL