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The cancel button was added back due to privacy team's concern. UI
reviewers requested swapping the positions of the help button and
the cancel button, and adding button style to the cancel button.
Screenshot of this implementation has received a LGTM on UI review
thread.

Bug: b:156258540, b:144861739
Change-Id: I60d0bd83e305e2c737fad01cce67ee2c7b563cb2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2531014
Commit-Queue: Yicheng Li <yichengli@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826957}