Fix compile error.

R=jkummerow@chromium.org
BUG=

Review URL: https://codereview.chromium.org/25674004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@17064 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/runtime.cc

@@ -1571,7 +1571,7 @@ RUNTIME_FUNCTION(MaybeObject*, Runtime_GetPrototype) {
   ASSERT(!obj->IsAccessCheckNeeded() || obj->IsJSObject());
   do {
     if (obj->IsAccessCheckNeeded() &&
-        !isolate->MayNamedAccessWrapper(obj,
+        !isolate->MayNamedAccessWrapper(Handle<JSObject>::cast(obj),
                                         isolate->factory()->proto_string(),
                                         v8::ACCESS_GET)) {
       isolate->ReportFailedAccessCheck(JSObject::cast(*obj), v8::ACCESS_GET);