Backed out changeset be9bb9b16fc0 (bug 1698156) for causing hazard failures.
Backed out changeset be9bb9b16fc0 (bug 1698156) for causing hazard failures.

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/c9ec596a51aa9611910aa64128071c1a0a0cd601

servo/webrender,servo/webrender,servo/webrender,servo/webrender,servo/webrender,servo/webrender