Allow the global object to be frozen through the global template

src/api-natives.cc

Index: src/api-natives.cc
diff --git a/src/api-natives.cc b/src/api-natives.cc
index ab1b06256e0301b0ba60ef4705a203ed9a3476b5..3fe59e293d3ff2d1d8d3b3fd688897334e6e95c8 100644
--- a/src/api-natives.cc
+++ b/src/api-natives.cc
@@ -613,10 +613,12 @@ Handle<JSFunction> ApiNatives::CreateApiFunction(
   }
 
   int internal_field_count = 0;
+  bool immutable_proto = false;
   if (!obj->instance_template()->IsUndefined(isolate)) {
     Handle<ObjectTemplateInfo> instance_template = Handle<ObjectTemplateInfo>(
         ObjectTemplateInfo::cast(obj->instance_template()));
     internal_field_count = instance_template->internal_field_count();
+    immutable_proto = instance_template->immutable_proto();
   }
 
   // TODO(svenpanne) Kill ApiInstanceType and refactor things by generalizing
@@ -676,6 +678,8 @@ Handle<JSFunction> ApiNatives::CreateApiFunction(
     map->set_is_constructor(true);
   }
 
+  if (immutable_proto) map->set_immutable_proto(true);
+
   return result;
 }