Bug 1543359 - P14. Fix "Wrench" test. a=wrench-fix  CLOSED TREE
Bug 1543359 - P14. Fix "Wrench" test. a=wrench-fix  CLOSED TREE

[wrupdater] From https://hg.mozilla.org/mozilla-central/rev/548006270186521a3f883ae266ac7ae869cc1fd3

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