Fix new dart2dart backend.

pkg/compiler/lib/src/universe/universe.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 universe;
 
 import '../elements/elements.dart';
 import '../dart2jslib.dart';
 import '../dart_types.dart';
 import '../types/types.dart';
@@ skipping 308 matching lines @@
       } else {
         return new Selector.call(
             name, element.library, arity, namedArguments);
       }
     } else if (element.isSetter) {
       return new Selector.setter(name, element.library);
     } else if (element.isGetter) {
       return new Selector.getter(name, element.library);
     } else if (element.isField) {
       return new Selector.getter(name, element.library);
+    } else if (element.isConstructor) {
+      return new Selector.callConstructor(name, element.library);
     } else {
       throw new SpannableAssertionFailure(
           element, "Can't get selector from $element");
     }
   }
 
   factory Selector.getter(String name, LibraryElement library)
       => new Selector(SelectorKind.GETTER, name, library, 0);
 
   factory Selector.getterFrom(Selector selector)
@@ skipping 35 matching lines @@
   factory Selector.callClosureFrom(Selector selector)
       => new Selector(SelectorKind.CALL, CALL_NAME, null,
                       selector.argumentCount, selector.namedArguments);
 
   factory Selector.callConstructor(String name, LibraryElement library,
                                    [int arity = 0,
                                     List<String> namedArguments])
       => new Selector(SelectorKind.CALL, name, library,
                       arity, namedArguments);
 
-  factory Selector.callDefaultConstructor(LibraryElement library)
-      => new Selector(SelectorKind.CALL, "", library, 0);
+  factory Selector.callDefaultConstructor()
+      => new Selector(SelectorKind.CALL, "", null, 0);
 
   bool get isGetter => identical(kind, SelectorKind.GETTER);
   bool get isSetter => identical(kind, SelectorKind.SETTER);
   bool get isCall => identical(kind, SelectorKind.CALL);
   bool get isClosureCall {
     String callName = Compiler.CALL_OPERATOR_NAME;
     return isCall && name == callName;
   }
 
   bool get isIndex => identical(kind, SelectorKind.INDEX) && argumentCount == 1;
@@ skipping 444 matching lines @@
 
   Selector extendIfReachesAll(Compiler compiler) {
     bool canReachAll = compiler.enabledInvokeOn
         && mask.needsNoSuchMethodHandling(this, compiler.world);
     return canReachAll
         ? new TypedSelector(
             compiler.typesTask.dynamicType, this, compiler.world)
         : this;
   }
 }