Remove unneeded generation of default constructors from the dart backend.

tests/language/unresolved_default_constructor_test.dart

 // Copyright (c) 2014, 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 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
+}