Further reduce LookupResult usage

src/bootstrapper.cc

Index: src/bootstrapper.cc
diff --git a/src/bootstrapper.cc b/src/bootstrapper.cc
index bfd9f5e918fd247778372daf947a722e83ab1064..b7e7ef614faf63fe9177e9600218c2504a4adeb5 100644
--- a/src/bootstrapper.cc
+++ b/src/bootstrapper.cc
@@ -2445,11 +2445,10 @@ void Genesis::TransferNamedProperties(Handle<JSObject> from,
           break;
         }
         case CALLBACKS: {
-          LookupResult result(isolate());
-          Handle<Name> key(Name::cast(descs->GetKey(i)), isolate());
-          to->LookupOwn(key, &result);
+          Handle<Name> key(descs->GetKey(i));
+          LookupIterator it(to, key, LookupIterator::CHECK_PROPERTY);
           // If the property is already there we skip it
-          if (result.IsFound()) continue;
+          if (it.IsFound() && it.HasProperty()) continue;
           HandleScope inner(isolate());
           DCHECK(!to->HasFastProperties());
           // Add to dictionary.
@@ -2478,10 +2477,9 @@ void Genesis::TransferNamedProperties(Handle<JSObject> from,
       if (properties->IsKey(raw_key)) {
         DCHECK(raw_key->IsName());
         // If the property is already there we skip it.
-        LookupResult result(isolate());
         Handle<Name> key(Name::cast(raw_key));
-        to->LookupOwn(key, &result);
-        if (result.IsFound()) continue;
+        LookupIterator it(to, key, LookupIterator::CHECK_PROPERTY);
+        if (it.IsFound() && it.HasProperty()) continue;
         // Set the property.
         Handle<Object> value = Handle<Object>(properties->ValueAt(i),
                                               isolate());