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This CL changes GeneratedBackgroundPageJob 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 solve bugs where extension event listeners are not registered as
the request for extension background pages are aborted on system suspend.

BUG=898494

Change-Id: I12c267322e28aee573c14160a91868b1cbec0a1b
Reviewed-on: https://chromium-review.googlesource.com/c/1352443
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611884}