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This CL changes URLRequestFileJob to not suspend file url requests when the
system suspends. There is no reason to suspend requests which don't require
network activity.

This helps solves bugs where extension event listeners are not registered as
the request for extension background scripts are aborted on system suspend.

BUG=898494

Change-Id: I3ce676fc6dc204c8c58d282d5ed0e81f97b5cc2c
Reviewed-on: https://chromium-review.googlesource.com/c/1351730
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611374}