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This should make tests slightly faster in general, but in particular
they may help on Mac where the wait contributes to flakes.

Change-Id: I7b8711676123a7fd1ce58505dffbd29f4043b482
Bug: 1131588
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2434329
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811251}