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While comparing a rule against a url, url_pattern_index assumes that the
provided pattern and domains are in canonical form (internationalized domains in
punycode and non-ascii characters in percent-escaped utf8). Document this
expectation and disallow rules where the "urlFilter", "domains" and
"excludedDomains" properties consist of non-ascii characters.

BUG=878138

Change-Id: I0b23200349a1aee6ed13adb09f61621ab235917d
Reviewed-on: https://chromium-review.googlesource.com/1195095
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587363}