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This CL replaces tap event usages with click for oobe-back-button
elements.

Bug: 967793
Change-Id: I32d95983f80b025acaf75bb4f2390ec97eeae430
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1658837
Commit-Queue: Esmael El-Moslimany <aee@chromium.org>
Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#670165}