Ensure that ClassElement.lookupConstructor fails when looking up default constructor using Selector…

tests/compiler/dart2js_extra/this_redirecting_constructor_test.dart

Index: tests/compiler/dart2js_extra/this_redirecting_constructor_test.dart
diff --git a/tests/compiler/dart2js_extra/this_redirecting_constructor_test.dart b/tests/compiler/dart2js_extra/this_redirecting_constructor_test.dart
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index 0000000000000000000000000000000000000000..6962716375f02f073a73bb02f6663cd8ea4714ca
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+++ b/tests/compiler/dart2js_extra/this_redirecting_constructor_test.dart
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+// 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.
+
+// Confirm that redirecting named constructors are properly resolved.
+//
+// Note that this test may become invalid due to http://dartbug.com/5940.
+
+class C {
+  var x;
+  C() { x = 1; }
+  C.C() { x = 2; }
+  C.redirecting(): this.C();
+}
+
+main() {
+  var c = new C.redirecting();
+  Expect.equals(c.x, 2);
+}