dart2js: native classes go through the normal code path.

pkg/compiler/lib/src/js_emitter/code_emitter_task.dart

Index: pkg/compiler/lib/src/js_emitter/code_emitter_task.dart
diff --git a/pkg/compiler/lib/src/js_emitter/code_emitter_task.dart b/pkg/compiler/lib/src/js_emitter/code_emitter_task.dart
index e7d9421871a63207d3e3c74a549a485e998e51eb..1ed955de6b8697b24c611d8392df2f5cdc6dd14d 100644
--- a/pkg/compiler/lib/src/js_emitter/code_emitter_task.dart
+++ b/pkg/compiler/lib/src/js_emitter/code_emitter_task.dart
@@ -37,7 +37,7 @@ class CodeEmitterTask extends CompilerTask {
   /// This flag is updated in [computeNeededConstants].
   bool outputContainsConstantList = false;
 
-  final List<ClassElement> nativeClasses = <ClassElement>[];
+  final List<ClassElement> nativeClassesAndSubclasses = <ClassElement>[];
 
   /// Records if a type variable is read dynamically for type tests.
   final Set<TypeVariableElement> readTypeVariables =
@@ -338,13 +338,11 @@ class CodeEmitterTask extends CompilerTask {
       if (Elements.isNativeOrExtendsNative(element) &&
           !typeTestRegistry.rtiNeededClasses.contains(element)) {
         // For now, native classes and related classes cannot be deferred.
-        nativeClasses.add(element);
-        if (!element.isNative) {
-          assert(invariant(element,
-                           !compiler.deferredLoadTask.isDeferred(element)));
-          outputClassLists.putIfAbsent(compiler.deferredLoadTask.mainOutputUnit,
-              () => new List<ClassElement>()).add(element);
-        }
+        nativeClassesAndSubclasses.add(element);
+        assert(invariant(element,
+                         !compiler.deferredLoadTask.isDeferred(element)));
+        outputClassLists.putIfAbsent(compiler.deferredLoadTask.mainOutputUnit,
+            () => new List<ClassElement>()).add(element);
       } else {
         outputClassLists.putIfAbsent(
             compiler.deferredLoadTask.outputUnitForElement(element),