Fix casts and type assertions on mixins used in native classes

sdk/lib/_internal/compiler/implementation/compiler.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 dart2js;
 
 /**
  * If true, print a warning for each method that was resolved, but not
  * compiled.
  */
@@ skipping 146 matching lines @@
   /// Called during resolution to notify to the backend that the
   /// program has a catch statement with a stack trace.
   void registerStackTraceInCatch(TreeElements elements) {}
 
   /// Register an is check to the backend.
   void registerIsCheck(DartType type,
                        Enqueuer enqueuer,
                        TreeElements elements) {}
 
   /// Register an as check to the backend.
-  void registerAsCheck(DartType type, TreeElements elements) {}
+  void registerAsCheck(DartType type,
+                       Enqueuer enqueuer,
+                       TreeElements elements) {}
 
   /// Register that the application may throw a [NoSuchMethodError].
   void registerThrowNoSuchMethod(TreeElements elements) {}
 
   /// Register that the application may throw a [RuntimeError].
   void registerThrowRuntimeError(TreeElements elements) {}
 
   /// Register that the application may throw an
   /// [AbstractClassInstantiationError].
   void registerAbstractClassInstantiation(TreeElements elements) {}
@@ skipping 1383 matching lines @@
 
   void close() {}
 
   toString() => name;
 
   /// Convenience method for getting an [api.CompilerOutputProvider].
   static NullSink outputProvider(String name, String extension) {
     return new NullSink('$name.$extension');
   }
 }