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This method has no callers (outside of unittests).  The last caller
(ResourceDispatcherHostImpl::ShouldServiceRequest) has been removed in
r682144.

The removal is especially desirable, given that CanSetAsOriginHeader is
one of few places which used to call CanAccessDataForOrigin from an IO
thread (making it difficult to introduce Citadel-style Site Isolation
enforcements).

Bug: 764958
Change-Id: I9d38e00c29fc7d391cfdbbde17987b9c2e1b66a0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1824145
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700004}