Move towards using WorldImpact for codegen

pkg/compiler/lib/src/js_emitter/interceptor_stub_generator.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 dart2js.js_emitter;
 
 class InterceptorStubGenerator {
   final Compiler compiler;
   final Namer namer;
   final JavaScriptBackend backend;
@@ skipping 39 matching lines @@
 
     bool hasArray = false;
     bool hasBool = false;
     bool hasDouble = false;
     bool hasInt = false;
     bool hasNull = false;
     bool hasNumber = false;
     bool hasString = false;
     bool hasNative = false;
     bool anyNativeClasses =
-        compiler.enqueuer.codegen.nativeEnqueuer.hasInstantiatedNativeClasses();
+        compiler.enqueuer.codegen.nativeEnqueuer.hasInstantiatedNativeClasses;
 
     for (ClassElement cls in classes) {
       if (cls == helpers.jsArrayClass ||
           cls == helpers.jsMutableArrayClass ||
           cls == helpers.jsFixedArrayClass ||
           cls == helpers.jsExtendableArrayClass)
         hasArray = true;
       else if (cls == helpers.jsBoolClass)
         hasBool = true;
       else if (cls == helpers.jsDoubleClass)
@@ skipping 319 matching lines @@
 
           var map = new jsAst.ObjectInitializer(properties);
           elements.add(map);
         }
       }
     }
 
     return new jsAst.ArrayInitializer(elements);
   }
 }