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On Chrome OS we have a 3 seconds timeout for UI shutdown.  If Chrome
fails to stop itself in 3 seconds when the ui.conf job requests it, a
fail safe mechanims would kill the Chrome processes with SIGABRT.

If we happen to be in the middle of updating the camera info through
Mojo IPC, the 3 seconds Mojo IPC timeout would cause ui.conf to kill
Chrome with SIGABRT.

Bug: 940623
Change-Id: I96e75b9af1dc2060a305a8835a2352683414d6b3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1858024Reviewed-by: Shik Chen <shik@chromium.org>
Commit-Queue: Ricky Liang <jcliang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705493}