Simplify parsing of 'new' operator.

tests/language/src/Factory3NegativeTest.dart

Index: tests/language/src/Factory3NegativeTest.dart
===================================================================
--- tests/language/src/Factory3NegativeTest.dart	(revision 0)
+++ tests/language/src/Factory3NegativeTest.dart	(revision 0)
@@ -0,0 +1,22 @@
+// 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.
+
+// Test compile time error for factories with parameterized types.
+
+interface Link<T> default LinkFactory {
+  Link.create();
+}
+
+class A<T> { }
+
+// Compile time error: should be LinkFactory<T> to match interface above
+class LinkFactory extends A<int> {
+  factory Link.create() {
+    return null;
+  }
+}
+
+main() {
+  var a = new Link<int>.create();
+}