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The test terminated its loop in the correct condition, but logged as if
it hadn't.  Adjust the code so it logs when the loop doesn't terminate.

Bug: none
Change-Id: I6587eccf76538a6170df84c7dfb58a179cf3f498
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2116540
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#752717}