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The 'none' default allowlist has been removed from the spec, as it was
never used, and further spec changes have made it unlikely that it will
be usable in the future.

Bug: 1095641
Change-Id: Ib7b5eae2e022f726dc6dc616ef3382f2d82861df
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2354419Reviewed-by: Charlie Hu <chenleihu@google.com>
Commit-Queue: Ian Clelland <iclelland@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798722}