• Bug 1571971 - Remove unused background_color field in Frame struct r=gw 

    Differential Revision: https://phabricator.services.mozilla.com/D52303

[wrupdater] From https://hg.mozilla.org/mozilla-central/rev/7019a4a1fe39964f90b14158e84d05d727d888bd
    @bpeersmoz @moz-gfx
    bpeersmoz authored and moz-gfx committed Nov 13, 2019
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