Make hasNext a getter instead of a method.

lib/compiler/implementation/lib/string_helper.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.
 
 class StringMatch implements Match {
   const StringMatch(int this._start,
                     String this.str,
                     String this.pattern);
 
   int start() => _start;
@@ skipping 46 matching lines @@
   return result;
 }
 
 stringContainsUnchecked(receiver, other, startIndex) {
   if (other is String) {
     return receiver.indexOf(other, startIndex) != -1;
   } else if (other is JSSyntaxRegExp) {
     return other.hasMatch(receiver.substring(startIndex));
   } else {
     var substr = receiver.substring(startIndex);
-    return other.allMatches(substr).iterator().hasNext();
+    return other.allMatches(substr).iterator().hasNext;
   }
 }
 
 stringReplaceJS(receiver, replacer, to) {
   // The JavaScript String.replace method recognizes replacement
   // patterns in the replacement string. Dart does not have that
   // behavior.
   to = JS('String', r"#.replace('$', '$$$$')", to);
   return JS('String', r'#.replace(#, #)', receiver, replacer, to);
 }
@@ skipping 52 matching lines @@
     var re = regExpGetNative(pattern);
     return JS('List', r'#.split(#)', receiver, re);
   } else {
     throw "StringImplementation.split(Pattern) UNIMPLEMENTED";
   }
 }
 
 stringJoinUnchecked(array, separator) {
   return JS('String', r'#.join(#)', array, separator);
 }