OOR-CORS: support DefaultPolicyHostRestrictions updates

PermissionsUpdater::SetDefaultPolicyHostRestrictions needs to
update cors access lists as well as other permission updating
methods do.

This patch extends NetworkPermissionsUpdateHelper to support
the default policy host restrictions case in addition to
permissions update.

This makes following tests pass with OOR-CORS.
 - BackgroundXhrWebstoreTest.PolicyContentScriptXHR
 - BackgroundXhrWebstoreTest.PolicyUpdateXHR
 - BackgroundXhrWebstoreTest.PolicyUpdateIndividualXHR
 - BackgroundXhrWebstoreTest.PolicyUpdateDefaultXHR

Bug: 907428
Change-Id: I0ae7777bd87baa1c98dfbefba44b9911eb9c08f8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1478661
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Takashi Toyoshima <toyoshim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#637600}
6 files changed