Bug 1606940 [wpt PR 21035] - Update wpt metadata, a=testonly

wpt-pr: 21035 wpt-type: metadata
2020-01-07 00:53:40 +00:00 · 2020-01-07 00:53:40 +00:00 · b4e9f5046b
--- a/testing/web-platform/meta/css/cssom/dir.ini
+++ b/testing/web-platform/meta/css/cssom/dir.ini
@ -0,0 +1 @@
+leak-threshold: [default:51200]