Make hasNext a getter instead of a method.

pkg/unittest/mock.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.
 
 /**
  * The error formatter for mocking is a bit different from the default one
  * for unit testing; instead of the third argument being a 'reason'
  * it is instead a [signature] describing the method signature filter
  * that was used to select the logs that were verified.
  */
@@ skipping 763 matching lines @@
           for (var i = scratch.length - numToCopy; i < scratch.length; i++) {
             rtn.logs.add(scratch[i]);
           }
           scratch.clear();
         } else {
           remainingCount = distance > 0 ? distance : logs.length;
         }
         if (includeKeys) {
           rtn.logs.add(keyEntry);
         }
-        if (keyIterator.hasNext()) {
+        if (keyIterator.hasNext) {
           keyEntry = keyIterator.next();
         } else if (isPreceding) { // We're done.
           break;
         }
       } else if (remainingCount > 0 &&
                  mockNameFilter.matches(logEntry.mockName, matchState) &&
                  logFilter(logEntry)) {
         if (scratch != null) {
           scratch.add(logEntry);
         } else {
@@ skipping 655 matching lines @@
       }
     }
   }
 
   /** Clear both logs and behavior. */
   void reset() {
     resetBehavior();
     clearLogs();
   }
 }