message: more StringUtil instead of std
diff: @@ -184,11 +184,11 @@ static inline const char *PreviousNewline(const char *ptr) {
  }
  static inline void TrimWhitespace(JSONLine &line) {
  - while (line.size != 0 && std::isspace(line[0])) {
  + while (line.size != 0 && StringUtil::CharacterIsSpace(line[0])) {
  line.pointer++;
  line.size--;
  }
  - while (line.size != 0 && std::isspace(line[line.size - 1])) {
  + while (line.size != 0 && StringUtil::CharacterIsSpace(line[line.size - 1])) {
  line.size--;
  }
  }
  