Compute the correct signature for default constructors.

dart/sdk/lib/_internal/compiler/implementation/resolution/members.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.
 
 part of resolution;
 
 abstract class TreeElements {
   Element get currentElement;
   Set<Node> get superUses;
 
@@ skipping 3319 matching lines @@
     return mixinApplication.computeType(compiler);
   }
 
   bool isDefaultConstructor(FunctionElement constructor) {
     return constructor.name == const SourceString('') &&
         constructor.computeSignature(compiler).parameterCount == 0;
   }
 
   FunctionElement createForwardingConstructor(FunctionElement target,
                                               ClassElement enclosing) {
-    return new SynthesizedConstructorElementX(target.name,
-                                              target,
-                                              enclosing);
+    return new SynthesizedConstructorElementX(
+        target.name, target, enclosing, false);
   }
 
   void doApplyMixinTo(MixinApplicationElement mixinApplication,
                       DartType supertype,
                       DartType mixinType) {
     Node node = mixinApplication.parseNode(compiler);
 
     if (mixinApplication.supertype != null) {
       // [supertype] is not null if there was a cycle.
       assert(invariant(node, compiler.compilationFailed));
@@ skipping 715 matching lines @@
     return e;
   }
 
   /// Assumed to be called by [resolveRedirectingFactory].
   Element visitReturn(Return node) {
     Node expression = node.expression;
     return finishConstructorReference(visit(expression),
                                       expression, expression);
   }
 }