Bug 1434723 - Disable a failing mochitest from WR PR 2367. r=jrmuizel

MozReview-Commit-ID: JjZWoHZDhhk

--HG--
extra : rebase_source : 8bee8cb4c13a1a2df10d81b1a58fbf8bd722e430

dom/events/test/mochitest.ini

@@ -127,7 +127,7 @@ skip-if = toolkit == 'android' #CRASH_DUMP, RANDOM
 [test_bug944011.html]
 [test_bug944847.html]
 [test_bug946632.html]
-skip-if = (e10s && os == "mac") # bug 1252273
+skip-if = (e10s && os == "mac") || webrender # bug 1252273; bug 1424752 for webrender
 [test_bug967796.html]
 [test_bug985988.html]
 [test_bug998809.html]