Make hasNext a getter instead of a method.

tools/testing/dart/status_expression.dart

 // Copyright (c) 2011, 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.
 
 #library("status_expression");
 
 /**
  * Parse and evaluate expressions in a .status file for Dart and V8.
  * There are set expressions and Boolean expressions in a .status file.
  * The grammar is:
@@ skipping 164 matching lines @@
   String current;
 
   Scanner(this.tokens) {
     tokenIterator = tokens.iterator();
     advance();
   }
 
   bool hasMore() => current != null;
 
   void advance() {
-    current = tokenIterator.hasNext() ? tokenIterator.next() : null;
+    current = tokenIterator.hasNext ? tokenIterator.next() : null;
   }
 }
 
 
 class ExpressionParser {
   Scanner scanner;
 
   ExpressionParser(this.scanner);
 
   SetExpression parseSetExpression() => parseSetUnion();
@@ skipping 92 matching lines @@
           "Expected identifier in expression, got ${scanner.current}");
       TermConstant right = new TermConstant(scanner.current);
       scanner.advance();
       return new Comparison(left, right);
     } else {
       return new BooleanVariable(left);
     }
   }
 }