Bug 1531512 - Mark unused variables as unused for non-windows. r=kvark
Bug 1531512 - Mark unused variables as unused for non-windows. r=kvark

rustc 1.33 is smart enough to detect and complain about this.

Differential Revision: https://phabricator.services.mozilla.com/D21601

[wrupdater] From https://hg.mozilla.org/mozilla-central/rev/9519237a1392caed029ea3678143b060d38f512a

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