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WPT provides a "nonexistent" subdomain that it guarantees will never
resolve to any IP address [1].  Our test harness doesn't rely on
/etc/hosts to resolve these test domains, and uses rewrite rules
internally instead.  Those rewrite rules were blindly resolving all
*.test domains to 127.0.0.1; this patch adds an additional rule that
handles the nonexistent subdomain correctly.

[1] https://web-platform-tests.org/writing-tests/server-features.html#tests-involving-multiple-origins

Bug: 866003
Change-Id: I4e331490d56872b8dfc4db25973291ea6e099565
Reviewed-on: https://chromium-review.googlesource.com/1145487
Commit-Queue: Douglas Creager <dcreager@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577505}