Fix bot redness.

tests/compiler/dart2js/cpa_inference_test.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.
 
 import "package:expect/expect.dart";
 import '../../../sdk/lib/_internal/compiler/implementation/scanner/scannerlib.dart';
 import '../../../sdk/lib/_internal/compiler/implementation/source_file.dart';
 import '../../../sdk/lib/_internal/compiler/implementation/types/types.dart';
 
 import "parser_helper.dart";
@@ skipping 142 matching lines @@
     num floor();
   }
   abstract class int extends num {
     bool get isEven;
   }
   abstract class double extends num {
     bool get isNaN;
   }
   class bool {}
   class String {}
-  class Object {}
+  class Object {
+    Object();
+  }
   class Function {}
   abstract class List<E> {
     factory List([int length]) {}
   }
   abstract class Map<K, V> {}
   class Closure {}
   class Type {}
   class StackTrace {}
   class Dynamic_ {}
   bool identical(Object a, Object b) {}''';
@@ skipping 1396 matching lines @@
   testJsCallAugmentsSeenClasses();
   testIsCheck();
   testSeenClasses();
   testIntDoubleNum();
   testConcreteTypeToTypeMask();
   testSelectors();
   testMixins();
   testClosures();
   testNestedFunctions();
 }