Backed out changeset bfd7c7290cab (bug 851214) for bad comment

netwerk/ipc/NeckoParent.cpp

@@ -98,6 +98,13 @@ NeckoParent::GetValidatedAppInfo(const SerializedLoadContext& aSerialized,
       if (tabParent->HasOwnApp()) {
         return "TabParent reports NECKO_NO_APP_ID but also is an app";
       }
+      if (UsingNeckoIPCSecurity() && tabParent->IsBrowserElement()) {
+        // <iframe mozbrowser> which doesn't have an <iframe mozapp> above it.
+        // This is not supported now, and we'll need to do a code audit to make
+        // sure we can handle it (i.e don't short-circuit using separate
+        // namespace if just appID==0)
+        return "TabParent reports appId=NECKO_NO_APP_ID but is a mozbrowser";
+      }
     }
   } else {
     // Only trust appId/inBrowser from child-side loadcontext if we're in