[modules] Remove @@iterator on namespace objects.

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index 5cdda84e57eec87964b25fbd99026aac0c96b31f..5d760f12654a7a7fb9133e1b0be7ae114aff0807 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -2472,7 +2472,7 @@ void Genesis::InitializeGlobal(Handle<JSGlobalObject> global_object,
     Handle<Map> map =
         factory->NewMap(JS_MODULE_NAMESPACE_TYPE, JSModuleNamespace::kSize);
     Map::SetPrototype(map, isolate->factory()->null_value());
-    Map::EnsureDescriptorSlack(map, 2);
+    Map::EnsureDescriptorSlack(map, 1);
     native_context()->set_js_module_namespace_map(*map);
 
     {  // Install @@toStringTag.
@@ -2483,16 +2483,6 @@ void Genesis::InitializeGlobal(Handle<JSGlobalObject> global_object,
                                attribs);
       map->AppendDescriptor(&d);
     }
-
-    {  // Install @@iterator.
-      Handle<JSFunction> iterator = SimpleCreateFunction(
-          isolate, factory->NewStringFromAsciiChecked("[Symbol.iterator]"),
-          Builtins::kModuleNamespaceIterator, 0, true);
-      iterator->shared()->set_native(true);
-      // TODO(neis): Is this really supposed to be writable?
-      DataConstantDescriptor d(factory->iterator_symbol(), iterator, DONT_ENUM);
-      map->AppendDescriptor(&d);
-    }
   }
 
   {  // -- I t e r a t o r R e s u l t
@@ -3088,25 +3078,6 @@ void Bootstrapper::ExportFromRuntime(Isolate* isolate,
         *generator_function_function);
   }
 
-  {  // -- F i x e d A r r a y I t e r a t o r
-    int size = JSFixedArrayIterator::kHeaderSize +
-               JSFixedArrayIterator::kInObjectPropertyCount * kPointerSize;
-    Handle<Map> map = factory->NewMap(JS_FIXED_ARRAY_ITERATOR_TYPE, size);
-    Map::SetPrototype(map, iterator_prototype);
-    Map::EnsureDescriptorSlack(map,
-                               JSFixedArrayIterator::kInObjectPropertyCount);
-    map->SetInObjectProperties(JSFixedArrayIterator::kInObjectPropertyCount);
-    map->SetConstructor(native_context->object_function());
-
-    {  // next
-      DataDescriptor d(factory->next_string(), JSFixedArrayIterator::kNextIndex,
-                       DONT_ENUM, Representation::Tagged());
-      map->AppendDescriptor(&d);
-    }
-
-    native_context->set_fixed_array_iterator_map(*map);
-  }
-
   {  // -- S e t I t e r a t o r
     Handle<JSObject> set_iterator_prototype =
         isolate->factory()->NewJSObject(isolate->object_function(), TENURED);