Include U+0517 in set of Cyrillic/Latin lookalikes.

Cyrillic letter U+0517 (ԗ) looks somewhat similar to the Latin letter p.
This CL adds this character to the set of Cyrillic characters that look
like Latin characters. Domains made up entirely of Cyrillic/Latin
lookalikes are displayed as punycode in URLs.

Bug: 863663
Change-Id: I4340c48d124c9c4cd3d3b5d0f9d3865d709e082d
Reviewed-on: https://chromium-review.googlesource.com/c/1286825
Commit-Queue: Joe DeBlasio <jdeblasio@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600582}