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This patches introduces OriginAccessList in the NetworkService
to manage origin whitelisting in the NetworkService. Also the class
is designed to be used even in Blink to unify existing whitelisting
implementation in blink::SecurityPolicy.

Bug: 870172
Cq-Include-Trybots: luci.chromium.try:linux_mojo
Change-Id: If44cfadbbf88f5b55c8bc2b01c1ae87c7a6e0a74
Tbr: mkwst@chromium.org, rdevlin.cronin@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/1183203
Commit-Queue: Takashi Toyoshima <toyoshim@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586623}