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...and use ResourceError::CancelledDueToAccessControlCheck instead.

This change is needed to make DocumentThreadableLoader consistent with
ResourceLoader regarding security checks.

Bug: 702845
Change-Id: Idfd0b9451d91ddaeea2e18cbcbdee0c955242e48
Reviewed-on: https://chromium-review.googlesource.com/569943Reviewed-by: Bill Budge <bbudge@chromium.org>
Reviewed-by: Mounir Lamouri <mlamouri@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Takeshi Yoshino <tyoshino@chromium.org>
Commit-Queue: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487382}