Issue 3499 - Use the new messaging API for object tabs

lib/objectTabs.js

Index: lib/objectTabs.js
===================================================================
--- a/lib/objectTabs.js
+++ b/lib/objectTabs.js
@@ -16,16 +16,17 @@
  */
 
 /**
  * @fileOverview Code responsible for showing and hiding object tabs.
  */
 
 let {Prefs} = require("prefs");
 let {Utils} = require("utils");
+let {port} = require("messaging");
 
 /**
  * Random element class, to be used for object tabs displayed on top of the
  * plugin content.
  * @type string
  */
 let classVisibleTop = null;
 
@@ -37,35 +38,35 @@ let classVisibleTop = null;
 let classVisibleBottom = null;
 
 /**
  * Random element class, to be used for object tabs that are hidden.
  * @type string
  */
 let classHidden = null;
 
-Utils.addChildMessageListener("AdblockPlus:GetObjectTabsStatus", function()
+port.on("getObjectTabsStatus", function(message, sender)
 {
   let {UI} = require("ui");
 
   return !!(Prefs.enabled && Prefs.frameobjects && UI.overlay && classHidden);
 });
 
-Utils.addChildMessageListener("AdblockPlus:GetObjectTabsTexts", function()
+port.on("getObjectTabsTexts", function(message, sender)
 {
   let {UI} = require("ui");
 
   return {
     label: UI.overlay.attributes.objtabtext,
     tooltip: UI.overlay.attributes.objtabtooltip,
     classVisibleTop, classVisibleBottom, classHidden
   };
 });
 
-Utils.addChildMessageListener("AdblockPlus:BlockItem", function({request, nodesID})
+port.on("blockItem", function({request, nodesID}, sender)
 {
   let {UI} = require("ui");
   UI.blockItem(UI.currentWindow, nodesID, request);
 });
 
 function init()
 {
   function processCSSData(event)