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The current implementation of checking high confidence allowlist returns
NO_MATCH if any of the following apply:
1. The DB isn't enabled yet.
2. If the URL scheme can't be checked.
3. If the list hasn't been loaded from the disk yet.

Since Chrome now falls back to hash based checks in the case of an allowlist
match, it's safe to return MATCH if any of the above conditions happen.

Bug: 963165
Change-Id: I3b311ed6124865c5e3236bd83dec62a640b6d881
Fixed: 1022628
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1906645
Auto-Submit: Varun Khaneja <vakh@chromium.org>
Reviewed-by: Daniel Rubery <drubery@chromium.org>
Commit-Queue: Varun Khaneja <vakh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714339}