Fix assert in Runtime_SetIsObserved.

R=rafaelw@chromium.org
BUG=chromium:352664
LOG=N

Review URL: https://codereview.chromium.org/204493002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@20440 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/objects.cc

@@ -5645,11 +5645,9 @@ Handle<Object> JSObject::Freeze(Handle<JSObject> object) {
 
 
 void JSObject::SetObserved(Handle<JSObject> object) {
+  ASSERT(!object->map()->is_observed());
   Isolate* isolate = object->GetIsolate();
 
-  if (object->map()->is_observed())
-    return;
-
   LookupResult result(isolate);
   object->map()->LookupTransition(*object,
                                   isolate->heap()->observed_symbol(),

src/runtime.cc

@@ -14882,8 +14882,6 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_SetIsObserved) {
   if (obj->IsJSProxy())
     return isolate->heap()->undefined_value();
 
-  ASSERT(!(obj->map()->is_observed() && obj->IsJSObject() &&
-           Handle<JSObject>::cast(obj)->HasFastElements()));
   ASSERT(obj->IsJSObject());
   JSObject::SetObserved(Handle<JSObject>::cast(obj));
   return isolate->heap()->undefined_value();