Remove a small range of Tibetan characters from the allowed IDN set on Mac.

components/url_formatter/url_formatter_unittest.cc

Index: components/url_formatter/url_formatter_unittest.cc
diff --git a/components/url_formatter/url_formatter_unittest.cc b/components/url_formatter/url_formatter_unittest.cc
index a59b4b6b4d668585ce36df1064df0b2e0e118e92..4b114f0f87a50fc1aec091ebcb91b25eba8df4a5 100644
--- a/components/url_formatter/url_formatter_unittest.cc
+++ b/components/url_formatter/url_formatter_unittest.cc
@@ -355,6 +355,10 @@ const IDNTestCase idn_cases[] = {
   {"xn--ab-yod.com", L"a\x05f4" L"b.com", false},
   // Hebrew Gershayim with Arabic is disallowed.
   {"xn--5eb7h.eg", L"\x0628\x05f4.eg", false},
+#if defined(OS_MACOSX)
+  // Tibetan transliteration characters are disallowed on Mac.
+  {"xn--com-luma.test.pl", L"\u0f8c.test.pl", false},
+#endif
 
   // Hyphens (http://unicode.org/cldr/utility/confusables.jsp?a=-)
   // Hyphen-Minus (the only hyphen allowed)