Backed out changeset f951099c6a3c (bug 836654)

b2g/chrome/content/shell.js

@@ -526,8 +526,7 @@ var shell = {
       url: msg.uri,
       manifestURL: msg.manifest,
       isActivity: (msg.type == 'activity'),
-      target: msg.target,
-      expectingSystemMessage: true
+      target: msg.target
     });
   },