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Focus rings are rendered differently in dark mode, so we need additional
pixel tests for dark mode.

Original change: crrev.com/839189
Revert: crrev.com/839445

The original change failed because the trybots didn't have dark mode
selected in the system preferences like my machine. I fixed this by
removing the "light" option in the meta tag of the test, which makes it
ignore the system preferences setting.

Fixed: 1067517
Change-Id: I426f70fd376097e75d795470f973ede1a5a43684
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2600335Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Yu Han <yuzhehan@chromium.org>
Commit-Queue: Joey Arhar <jarhar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840450}