Remove unneeded generation of default constructors from the dart backend.

tests/language/unresolved_default_constructor_test.dart

Index: tests/language/unresolved_default_constructor_test.dart
diff --git a/tests/language/issue20476_test.dart b/tests/language/unresolved_default_constructor_test.dart
similarity index 55%
copy from tests/language/issue20476_test.dart
copy to tests/language/unresolved_default_constructor_test.dart
index 35890a672dc6476dd2b20129c02a0d757dbfb945..3adbdd935c9d0b3f7966d92f5216fd2d91fecbbf 100644
--- a/tests/language/issue20476_test.dart
+++ b/tests/language/unresolved_default_constructor_test.dart
@@ -2,23 +2,17 @@
 // 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 unresolved default constructor calls remain unresolved after dart2dart
+// translation.
+
 import 'package:expect/expect.dart';
 
-foo() {
-  try {
-    try {
-      return 1;
-    } catch (e1) {
-    } finally {
-      return 3;
-    }
-  } catch (e2) {
-  } finally  {
-    return 5;
-  }
+class A {
+  A.named();
+  static method() {}
 }
 
-
 main() {
-  Expect.equals(5, foo());
-}
+  A.method();
+  Expect.throws(() => new A()); /// 01: static type warning
+}