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The version of dbus-launch on the bots does not support --exit-with-x11.
Instead, send SIGKILL to the daemon's pid to ensure it exits with xvfb.py.

Also, PRESUBMIT.py fails due to a URL exceeding the 80-column limit, even though
this line is not modified by this CL. Replace the URL with a commit hash to
prevent presubmit failures in the future.

BUG=1013812,1027852
R=dpranke

Change-Id: I974e3aae9282fc593fc8c86cedfe55c684a7e7f1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1949027
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Auto-Submit: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721133}