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The existing example fuzzer code used RunUntilIdle to avoid runloop
recursion issues caused by re-entrancy in the scheduling of fuzzer
tasks. This change removes the re-entrancy and refactors out the use
of RunUntilIdle, working towards refactoring out the common code
duplication between fuzzers that's currently necessary.

Bug: 1076336
Change-Id: I3729d20264638c00c14c3a8149395e3f22e90089
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2329531
Commit-Queue: Mark Brand <markbrand@google.com>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799545}