[Webkit-unassigned] [Bug 172499] Remove support for custom system backdrops

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=172499

--- Comment #1 from Antti Koivisto <koivisto at iki.fi> ---
This is

-webkit-appearance: media-controls-dark-bar-background
-webkit-appearance: media-controls-light-bar-background

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