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If a suggestion has a remove suggestion button, this CL adds a voiceover
saying 'Press Tab then Enter to remove suggestion.'

If a suggestion has a remove suggestion button AND another option, the
voiceover will read 'multiple actions are available, press Tab to cycle
through them.' The Remove Suggestion button previously was not included
in the action count.

Bug: 1099798
Change-Id: I84f012d0f9d40a82a8c85214128ce25c6b4323b4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2533634Reviewed-by: Tommy Li <tommycli@chromium.org>
Reviewed-by: Aaron Leventhal <aleventhal@chromium.org>
Commit-Queue: Angela Yoeurng <yoangela@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826855}