Fix failure in NetUtilTest.IDNToUnicodeFast running on Chromecast.

Tracked the failure down to this function.   Looks like a simple typo,
test passes now.

BUG=internal b/19821810

Review URL: https://codereview.chromium.org/1020633002

Cr-Commit-Position: refs/heads/master@{#321627}

net/base/net_util_icu.cc

@@ -223,7 +223,7 @@ bool IsIDNComponentSafe(const base::char16* str,
   DCHECK(U_SUCCESS(status));
   icu::RegexMatcher dangerous_patterns(icu::UnicodeString(
       // Lone katakana no, so, or n
-      "[^\\p{Katakana}][\\u30ce\\u30f3\u30bd][^\\p{Katakana}]"
+      "[^\\p{Katakana}][\\u30ce\\u30f3\\u30bd][^\\p{Katakana}]"
       // Repeating Japanese accent characters
       "|[\\u3099\\u309a\\u309b\\u309c][\\u3099\\u309a\\u309b\\u309c]"),
       0, status);