Bug 595278 - Make sure the context outlives the request in NPAPI _evaluate (r=jst)

modules/plugin/base/src/nsNPAPIPlugin.cpp

@@ -1612,11 +1612,11 @@ _evaluate(NPP npp, NPObject* npobj, NPString *script, NPVariant *result)
   JSContext *cx = GetJSContextFromDoc(doc);
   NS_ENSURE_TRUE(cx, false);
 
-  JSAutoRequest req(cx);
-
   nsCOMPtr<nsIScriptContext> scx = GetScriptContextFromJSContext(cx);
   NS_ENSURE_TRUE(scx, false);
 
+  JSAutoRequest req(cx);
+
   JSObject *obj =
     nsNPObjWrapper::GetNewOrUsed(npp, cx, npobj);