Handle redirecting factories.

pkg/compiler/lib/src/resolution/resolution.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.
 
 library dart2js.resolution;
 
 import 'dart:collection' show Queue;
 
 import '../common.dart';
 import '../common/names.dart' show Identifiers;
@@ skipping 400 matching lines @@
     if (annotation == null) return const DynamicType();
     DartType result = visitorFor(element).resolveTypeAnnotation(annotation);
     if (result == null) {
       // TODO(karklose): warning.
       return const DynamicType();
     }
     return result;
   }
 
   void resolveRedirectionChain(
-      ConstructorElementX constructor, Spannable node) {
-    ConstructorElementX target = constructor;
+      ConstructorElement constructor, Spannable node) {
+    ConstructorElement target = constructor;
     InterfaceType targetType;
     List<Element> seen = new List<Element>();
     bool isMalformed = false;
     // Follow the chain of redirections and check for cycles.
     while (target.isRedirectingFactory || target.isPatched) {
-      if (target.effectiveTargetInternal != null) {
+      if (target.hasEffectiveTarget) {
         // We found a constructor that already has been processed.
-        targetType = target.effectiveTargetType;
+        // TODO(johnniwinther): Should `effectiveTargetType` be part of the
+        // interface?
+        targetType = target.computeEffectiveTargetType(
+            target.enclosingClass.thisType);
         assert(invariant(target, targetType != null,
             message: 'Redirection target type has not been computed for '
                 '$target'));
-        target = target.effectiveTargetInternal;
+        target = target.effectiveTarget;
         break;
       }
 
       Element nextTarget;
       if (target.isPatched) {
         nextTarget = target.patch;
       } else {
         nextTarget = target.immediateRedirectionTarget;
       }
 
@@ skipping 652 matching lines @@
   TreeElements get treeElements {
     assert(invariant(this, _treeElements != null,
         message: "TreeElements have not been computed for $this."));
     return _treeElements;
   }
 
   void reuseElement() {
     _treeElements = null;
   }
 }