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This CL converts a pattern in extensions tests where a RunLoop quit
closure is bound to a callback argument. In most of these cases we can
simply convert to a OnceClosure.

printer_provider_apitest has one exception that's a RepeatingClosure
because the API actually may call the callback multiple times. In this
case, the quit closure must be copied so it must be a RepeatingClosure.

Bug: 1152268
Change-Id: I4a201cbd78d818f1793b94a8c106d62bb59ba8f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2605647
Commit-Queue: David Bokan <bokan@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840314}