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This reverts commit bc22eed4.

Reason for revert: Test added in this CL seems to fail on Mac: https://ci.chromium.org/p/chromium/builders/ci/Mac10.12%20Tests/34405

Original change's description:
> Rotating focus with F6 includes the caption bubble.
> 
> Allows users to focus into and out of the caption bubble using F6,
> which rotates focus between focusable panes.
> 
> AX-Relnotes: N/A
> Bug: 1055150
> Change-Id: I82efd54644fbc1cada2cb3e2f5cf4c52da21336a
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2197255
> Reviewed-by: Peter Kasting <pkasting@chromium.org>
> Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
> Reviewed-by: Abigail Klein <abigailbklein@google.com>
> Commit-Queue: Katie Dektar <katie@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#770294}

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

Change-Id: Ia50b02b11a4c304cf9013128756acb60b79e682e
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1055150
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2208776Reviewed-by: Darren Shen <shend@chromium.org>
Commit-Queue: Darren Shen <shend@chromium.org>
Cr-Commit-Position: refs/heads/master@{#770436}