Bug 1042798 - Use an AutoEntryScript in nsNPAPIPlugin _evaluate as we are about to run script and need to ensure the correct JSContext* gets pushed. r=bholley

dom/plugins/base/nsNPAPIPlugin.cpp

@@ -1483,8 +1483,8 @@ _evaluate(NPP npp, NPObject* npobj, NPString *script, NPVariant *result)
     return false;
   }
 
-  AutoSafeJSContext cx;
-  JSAutoCompartment ac(cx, win->FastGetGlobalJSObject());
+  dom::AutoEntryScript aes(win);
+  JSContext* cx = aes.cx();
 
   JS::Rooted<JSObject*> obj(cx, nsNPObjWrapper::GetNewOrUsed(npp, cx, npobj));