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Though the interface is plumbed, only one layout test calls it
for testing itself and there is no real user today. This interface
was introduced in WebKit era, and chromium use of this interface was
completely replaced by RemoveAllOriginAccessWhitelistEntriesForOrigin
in https://chromium-review.googlesource.com/c/chromium/src/+/1105287.

This is a trivial preparation for implementing origin whitelising
for the Network Service.

Bug: 870172
Change-Id: I4ff5a91d95dbb65fa30c471e77d44b7e2ad3a92a
Reviewed-on: https://chromium-review.googlesource.com/1175581Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Takashi Toyoshima <toyoshim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583203}