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This reverts commit f3d36175.

Reason for revert: The bug thought to be caused by this change was actually caused by crbug.com/966345 and fixed in https://chromium-review.googlesource.com/c/chromium/src/+/1636226/.

Original change's description:
> Revert "webvtt: Add background opacity in mac"
> 
> This reverts commit 8e606757.
> 
> Reason for revert: Caused crbug.com/964244
> 
> Original change's description:
> > webvtt: Add background opacity in mac
> >
> > To test, open a video that has a WebVTT captions file. For example, https://www.iandevlin.com/html5test/webvtt/html5-video-webvtt-sample.html is a nice example.
> >
> > Introduce new background opacity text track property for webvtt captions and wire it to apply opacity to the WebVTT caption HTML element.
> >
> > Bug: 897730
> > Change-Id: Ic8dabc2279117b7ff12eb75a9daa8d26c9d9bb25
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1592622
> > Commit-Queue: Abigail Klein <abigailbklein@google.com>
> > Auto-Submit: Abigail Klein <abigailbklein@google.com>
> > Reviewed-by: Avi Drissman <avi@chromium.org>
> > Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#659116}
> 
> Bug: 964244
> Change-Id: I76ce88cee600ed98d48426b49d1d88a40d95e507
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1622433
> Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
> Auto-Submit: Abigail Klein <abigailbklein@google.com>
> Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#662163}

TBR=ellyjones@chromium.org,abigailbklein@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 964244
Change-Id: Ib14f2e59e1b84525382b207131258a46c9a18cb4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1643927Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Commit-Queue: Abigail Klein <abigailbklein@google.com>
Cr-Commit-Position: refs/heads/master@{#666035}