Revert "Avoid use of empty string as a property name."

sdk/lib/_internal/compiler/implementation/js_emitter/class_builder.dart

Index: sdk/lib/_internal/compiler/implementation/js_emitter/class_builder.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_emitter/class_builder.dart b/sdk/lib/_internal/compiler/implementation/js_emitter/class_builder.dart
index 044368bb9d53833e27d581ce19ca2ef4a4096585..53e32d8de8789e56ec417f7c048f3eb78ac0bd1e 100644
--- a/sdk/lib/_internal/compiler/implementation/js_emitter/class_builder.dart
+++ b/sdk/lib/_internal/compiler/implementation/js_emitter/class_builder.dart
@@ -16,13 +16,9 @@ class ClassBuilder {
   String functionType;
   List<jsAst.Node> fieldMetadata;
 
-  final Namer namer;
-
   /// Set to true by user if class is indistinguishable from its superclass.
   bool isTrivial = false;
 
-  ClassBuilder(this.namer);
-
   // Has the same signature as [DefineStubFunction].
   void addProperty(String name, jsAst.Expression value) {
     properties.add(new jsAst.Property(js.string(name), value));
@@ -54,8 +50,7 @@ class ClassBuilder {
           new jsAst.ArrayInitializer.from([classData]..addAll(fieldMetadata));
     }
     var fieldsAndProperties =
-        [new jsAst.Property(js.string(namer.classDescriptorProperty),
-                            classData)]
+        [new jsAst.Property(js.string(''), classData)]
         ..addAll(properties);
     return new jsAst.ObjectInitializer(fieldsAndProperties, isOneLiner: false);
   }