CountCharInReadable_Impl( const basic_nsAReadableString<CharT>& aStr,
CountCharInReadable_Impl( const typename nsStringTraits<CharT>::abstract_string_type& aStr,
CountCharInReadable_Impl( const basic_nsAReadableString<CharT>& aStr,                          CharT aChar ){  PRUint32 count = 0;  nsReadingIterator<CharT> begin, end;    aStr.BeginReading(begin);  aStr.EndReading(end);    while (begin != end) {    if (*begin == aChar) {      count++;    }    begin++;  }  return count;}