CBU16_IS_SINGLE   782 base/json/json_parser.cc     DCHECK(CBU16_IS_SINGLE(code_unit16_high));
CBU16_IS_SINGLE   133 base/strings/string_split.cc   DCHECK(CBU16_IS_SINGLE(c));
CBU16_IS_SINGLE   189 base/strings/string_split.cc   DCHECK(CBU16_IS_SINGLE(c));