imported patch del-service-io.diff

Author: caisui

common/content/services.js

@@ -70,10 +70,6 @@ const Services = Module("services", {
                 class_: "@mozilla.org/intl/texttosuburi;1",
                 iface: Ci.nsITextToSubURI
             },
-            "io": {
-                class_: "@mozilla.org/network/io-service;1",
-                iface: Ci.nsIIOService
-            },
         };
 
         this.addClass("file",       "@mozilla.org/file/local;1",                 Ci.nsILocalFile);