• Bug 1510030 - Don't return the current opacity value from update_opac… 

    …ity_binding. r=gw

The return value is not used at all.

Differential Revision: https://phabricator.services.mozilla.com/D63600

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/b3dfa17c6305c657f8c3b3c95121c19f005d451c
    @hiikezoe @moz-gfx
    hiikezoe authored and moz-gfx committed Feb 27, 2020
    8353c5a