basic_nsAReadableString<CharT>::BeginReading( nsReadingIterator<CharT>& aResult ) const
basic_nsAReadableString<CharT>::BeginReading() const
basic_nsAReadableString<CharT>::BeginReading( nsReadingIterator<CharT>& aResult ) const  {    aResult.mOwningString = this;    GetReadableFragment(aResult.mFragment, kFirstFragment);    aResult.mPosition = aResult.mFragment.mStart;    aResult.normalize_forward();    return aResult;  }