dart2js: Use is-checks from the model in the old emitter.

pkg/compiler/lib/src/js_emitter/old_emitter/class_emitter.dart

Index: pkg/compiler/lib/src/js_emitter/old_emitter/class_emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/old_emitter/class_emitter.dart b/pkg/compiler/lib/src/js_emitter/old_emitter/class_emitter.dart
index 0b9666e5c73b7c1891106611687a6ce3b073b513..57974bf5e14c8d852da506dbd2b883261a0ee306 100644
--- a/pkg/compiler/lib/src/js_emitter/old_emitter/class_emitter.dart
+++ b/pkg/compiler/lib/src/js_emitter/old_emitter/class_emitter.dart
@@ -46,7 +46,7 @@ class ClassEmitter extends CodeEmitterHelper {
     emitClassGettersSettersForCSP(classElement, builder,
                                   onlyForRti: onlyForRti);
     emitInstanceMembers(classElement, builder, onlyForRti: onlyForRti);
-    emitter.typeTestEmitter.emitIsTests(classElement, builder);
+    emitRuntimeTypeInformation(cls, builder);
     if (additionalProperties != null) {
       additionalProperties.forEach(builder.addProperty);
     }
@@ -306,6 +306,18 @@ class ClassEmitter extends CodeEmitterHelper {
     }
   }
 
+  /// Emits the members from the model.
+  void emitRuntimeTypeInformation(Class cls, ClassBuilder builder) {
+    assert(builder.functionType == null);
+    if (cls.functionTypeIndex != null) {
+      builder.functionType = '${cls.functionTypeIndex}';
+    }
+
+    for (Method method in cls.isChecks) {
+      builder.addProperty(method.name, method.code);
+    }
+  }
+
   void emitClassBuilderWithReflectionData(String className,
                                           ClassElement classElement,
                                           ClassBuilder classBuilder,