Backed out changeset 5a952abc6c2f (bug 1035454) for Android debug M4 permafail.

--HG--
extra : rebase_source : 3e27fb16750f0df9bda5d83138bebf5932adc3fd

dom/apps/AppsServiceChild.jsm

@@ -131,6 +131,9 @@ this.DOMApplicationRegistry = {
     APPS_IPC_MSG_NAMES.forEach((aMsgName) => {
       this.cpmm.removeMessageListener(aMsgName, this);
     });
+
+    this.cpmm.sendAsyncMessage("Webapps:UnregisterForMessages",
+                               APPS_IPC_MSG_NAMES)
   },
 
   receiveMessage: function receiveMessage(aMessage) {