Bug 1789510 - Remove unnecessary parentheses. r=gfx-reviewers,bradwerth,gw
Bug 1789510 - Remove unnecessary parentheses. r=gfx-reviewers,bradwerth,gw

Rustc 1.64 warns about them (which --enable-warnings-as-errors turns
into an error).

Differential Revision: https://phabricator.services.mozilla.com/D156600

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/3ed5e161a0790b4d57b3c7f202f898781024acd1

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