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Lots of tests were listening for "permission request shown" using the
same class, and I want to add another.  First refactor to a common
location to avoid yet-more-copy-and-paste.

Bug: none
Change-Id: Iabf5ff8ad250e8b50a7f97ac3e2b15e75ef6c76f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2068093Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Kamila Hasanbega <hkamila@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#744020}