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The test code was waiting for an event emitted from the prod code,
but in some cases the event had already fired before the test code
had registered the listener, causing the test to hang indefinitely.

Fixed: 1104824
Change-Id: I10597aabc565ecbcef2dcd4e191cc80521f1686e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2316129
Auto-Submit: dpapad <dpapad@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Commit-Queue: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791527}