Incremental compiler: Use addStubs for adding methods.

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

Index: dart/pkg/compiler/lib/src/js_emitter/old_emitter/class_builder.dart
diff --git a/dart/pkg/compiler/lib/src/js_emitter/old_emitter/class_builder.dart b/dart/pkg/compiler/lib/src/js_emitter/old_emitter/class_builder.dart
index deb4fc44ba18ce9d2125fa356e1766b665ec58c4..c4b82d6a75c02f577fd2c912e5e19a4205d41f1e 100644
--- a/dart/pkg/compiler/lib/src/js_emitter/old_emitter/class_builder.dart
+++ b/dart/pkg/compiler/lib/src/js_emitter/old_emitter/class_builder.dart
@@ -34,7 +34,8 @@ class ClassBuilder {
     fields.add(field);
   }
 
-  jsAst.ObjectInitializer toObjectInitializer() {
+  jsAst.ObjectInitializer toObjectInitializer(
+      {bool omitClassDescriptor: false}) {
     StringBuffer buffer = new StringBuffer();
     if (superName != null) {
       buffer.write('$superName');
@@ -52,11 +53,17 @@ class ClassBuilder {
       classData =
           new jsAst.ArrayInitializer.from([classData]..addAll(fieldMetadata));
     }
-    var fieldsAndProperties =
-        [new jsAst.Property(js.string(namer.classDescriptorProperty),
-                            classData)]
-        ..addAll(properties);
+    List<jsAst.Property> fieldsAndProperties;
+    if (!omitClassDescriptor) {
+      fieldsAndProperties = <jsAst.Property>[];
+      fieldsAndProperties.add(
+          new jsAst.Property(
+              js.string(namer.classDescriptorProperty), classData));
+      fieldsAndProperties
+          ..addAll(properties);
+    } else {
+      fieldsAndProperties = properties;
+    }
     return new jsAst.ObjectInitializer(fieldsAndProperties, isOneLiner: false);
   }
-
 }