More function literal changes in tests.

tests/corelib/collection_from_test.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.
 
 class CollectionFromTest {
   static testMain() {
     var set = new Set<int>();
     set.add(1);
     set.add(2);
     set.add(4);
     check(set, new List<int>.from(set));
     check(set, new List.from(set));
     check(set, new Queue<int>.from(set));
     check(set, new Queue.from(set));
     check(set, new Set<int>.from(set));
     check(set, new Set.from(set));
   }
 
 
   static check(Collection initial, Collection other) {
     Expect.equals(3, initial.length);
     Expect.equals(initial.length, other.length);
 
     int initialSum = 0;
     int otherSum = 0;
 
-    initial.forEach(void f(e) { initialSum += e; });
-    other.forEach(void f(e) { otherSum += e; });
+    initial.forEach((e) { initialSum += e; });
+    other.forEach((e) { otherSum += e; });
     Expect.equals(4 + 2 + 1, otherSum);
     Expect.equals(otherSum, initialSum);
   }
 }
 
 main() {
   CollectionFromTest.testMain();
 }