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This works around issues where overlapped tabs confuses VoiceOver.

BUG=979803

Change-Id: I45f9fafa5b14187cc83ab935a3be385886ff8cb8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1933729Reviewed-by: Justin Cohen <justincohen@chromium.org>
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719166}