Make hasNext a getter instead of a method.

runtime/lib/byte_array.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 patch class Int8List {
   /* patch */ factory Int8List(int length) {
     return new _Int8Array(length);
   }
 
   /* patch */ factory Int8List.view(ByteArray array,
@@ skipping 1470 matching lines @@
       native "ExternalFloat64Array_setIndexed";
 }
 
 
 class _ByteArrayIterator<E> implements Iterator<E> {
   _ByteArrayIterator(List array)
     : _array = array, _length = array.length, _pos = 0 {
     assert(array is _ByteArrayBase || array is _ByteArrayViewBase);
   }
 
-  bool hasNext() {
+  bool get hasNext {
    return _length > _pos;
   }
 
   E next() {
-    if (!hasNext()) {
+    if (!hasNext) {
       throw const NoMoreElementsException();
     }
     return _array[_pos++];
   }
 
   final List<E> _array;
   final int _length;
   int _pos;
 }
 
@@ skipping 904 matching lines @@
     }
     _rangeCheck(this.length, start, length);
     return _array.subByteArray(_offset + start, length);
   }
 
   static const int _BYTES_PER_ELEMENT = 8;
   final ByteArray _array;
   final int _offset;
   final int _length;
 }