Fix test to not generate a NoSuchMethodError.

tests/compiler/dart2js/list_tracer_test.dart

 // Copyright (c) 2013, 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.
 
 import 'package:expect/expect.dart';
 import
     '../../../sdk/lib/_internal/compiler/implementation/types/types.dart'
     show ContainerTypeMask, TypeMask;
 
 import 'compiler_helper.dart';
@@ skipping 136 matching lines @@
   listUsedInLocal[0] = anInt;
   var a = listUsedInLocal;
   listUsedInLocal[1] = aDouble;
 
   // At least use [listUnused] in a local to pretend it's used.
   var b = listUnset;
 
   listOnlySetWithConstraint[0]++;
 
   listEscapingInSetterValue[0] = anInt;
-  new A().callSetter = listEscapingInSetterValue;
+  new A(null).callSetter = listEscapingInSetterValue;
 
   listEscapingInIndex[0] = anInt;
-  new A()[listEscapingInIndex];
+  new A(null)[listEscapingInIndex];
 
-  new A()[listEscapingInIndexSet] = 42;
+  new A(null)[listEscapingInIndexSet] = 42;
 
-  new A()[listEscapingTwiceInIndexSet] = listEscapingTwiceInIndexSet;
+  new A(null)[listEscapingTwiceInIndexSet] = listEscapingTwiceInIndexSet;
 
   listPassedAsOptionalParameter[0] = anInt;
   takeOptional(listPassedAsOptionalParameter);
 
   listPassedAsNamedParameter[0] = anInt;
   takeNamed(list: listPassedAsNamedParameter);
 
   listSetInNonFinalField[0] = anInt;
   new B(listSetInNonFinalField);
 
@@ skipping 47 matching lines @@
   checkType('listReturnedFromClosure', typesTask.dynamicType);
   checkType('listUsedWithNonOkSelector', typesTask.dynamicType);
   checkType('listPassedAsOptionalParameter', typesTask.dynamicType);
   checkType('listPassedAsNamedParameter', typesTask.dynamicType);
 
   if (!allocation.contains('filled')) {
     checkType('listUnset', new TypeMask.nonNullEmpty());
     checkType('listOnlySetWithConstraint', new TypeMask.nonNullEmpty());
   }
 }