Remove static state.

pkg/compiler/lib/src/native/enqueue.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.
 
 part of native;
 
 /**
  * This could be an abstract class but we use it as a stub for the dart_backend.
  */
 class NativeEnqueuer {
   /// Initial entry point to native enqueuer.
   void processNativeClasses(Iterable<LibraryElement> libraries) {}
 
   /// Notification of a main Enqueuer worklist element.  For methods, adds
   /// information from metadata attributes, and computes types instantiated due
   /// to calling the method.
   void registerElement(Element element) {}
 
   /// Notification of native field.  Adds information from metadata attributes.
   void handleFieldAnnotations(Element field) {}
 
   /// Computes types instantiated due to getting a native field.
   void registerFieldLoad(Element field) {}
 
   /// Computes types instantiated due to setting a native field.
   void registerFieldStore(Element field) {}
 
-  NativeBehavior getNativeBehaviorOf(Send node) => NativeBehavior.NONE;
+  NativeBehavior getNativeBehaviorOf(Send node) => new NativeBehavior();
 
   /// Returns whether native classes are being used.
   bool hasInstantiatedNativeClasses() => false;
 
   /**
    * Handles JS-calls, which can be an instantiation point for types.
    *
    * For example, the following code instantiates and returns native classes
    * that are `_DOMWindowImpl` or a subtype.
    *
@@ skipping 593 matching lines @@
         superclass,
         () => <ClassElement>[]);
     directSubtypes.add(cls);
   }
 
   void logSummary(log(message)) {
     log('Compiled ${registeredClasses.length} native classes, '
         '${unusedClasses.length} native classes omitted.');
   }
 }