NS_COUNT( InputIterator first, InputIterator last, const T& value )
NS_COUNT( InputIterator& first, const InputIterator& last, const T& value )
NS_COUNT( InputIterator first, InputIterator last, const T& value )  {    PRUint32 result = 0;    for ( ; first != last; ++first )      if ( *first == value )        ++result;    return result;  }