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Fix/deflake tests in /chrome/browser/chrome_site_per_process_browsertest.cc.

This is a prerequisite for switching WindowedNotificationObserver to use
base::RunLoop instead of deprecated MessageLoopRunner.

This CL is split out from https://crrev.com/c/982612.

This CL was uploaded by git cl split.

R=alexmos@chromium.org

Bug: 668707
Change-Id: Ic3c72233d13ee53965bc250602462da4b12aa4c8
Reviewed-on: https://chromium-review.googlesource.com/1120489Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Alexander Semashko <ahest@yandex-team.ru>
Cr-Commit-Position: refs/heads/master@{#571663}