Tighten up Object.observe code to ASSERT that it never deals with globals

src/objects.cc

Index: src/objects.cc
diff --git a/src/objects.cc b/src/objects.cc
index 87853f3805a9f3a8fc2463f35ce8b2effa9fc16e..a30d6ab0d1ceccea5a973752c3963faac83d651e 100644
--- a/src/objects.cc
+++ b/src/objects.cc
@@ -1976,12 +1976,11 @@ void JSObject::EnqueueChangeRecord(Handle<JSObject> object,
                                    const char* type_str,
                                    Handle<Name> name,
                                    Handle<Object> old_value) {
+  ASSERT(!object->IsJSGlobalProxy());
+  ASSERT(!object->IsJSGlobalObject());
   Isolate* isolate = object->GetIsolate();
   HandleScope scope(isolate);
   Handle<String> type = isolate->factory()->InternalizeUtf8String(type_str);
-  if (object->IsJSGlobalObject()) {
-    object = handle(JSGlobalObject::cast(*object)->global_receiver(), isolate);
-  }
   Handle<Object> args[] = { type, object, name, old_value };
   int argc = name.is_null() ? 2 : old_value->IsTheHole() ? 3 : 4;
 
@@ -5927,6 +5926,8 @@ MaybeHandle<Object> JSObject::Freeze(Handle<JSObject> object) {
 
 
 void JSObject::SetObserved(Handle<JSObject> object) {
+  ASSERT(!object->IsJSGlobalProxy());
+  ASSERT(!object->IsJSGlobalObject());
   Isolate* isolate = object->GetIsolate();
   Handle<Map> new_map;
   Handle<Map> old_map(object->map(), isolate);