Issue 2081 - Hide "Block element" option in the popup if the page is whitelisted

popup.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2015 Eyeo GmbH
  *
  * Adblock Plus is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 3 as
  * published by the Free Software Foundation.
  *
  * Adblock Plus is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 28 matching lines @@
     else if (!backgroundPage.htmlPages.has(page))
       document.body.classList.add("nohtml");
 
     // Ask content script whether clickhide is active. If so, show cancel button.
     // If that isn't the case, ask background.html whether it has cached filters. If so,
     // ask the user whether she wants those filters.
     // Otherwise, we are in default state.
     if (page)
     {
       if (isPageWhitelisted(page))
-        document.getElementById("enabled").classList.add("off");
+        document.body.classList.add("disabled");
 
       page.sendMessage({type: "get-clickhide-state"}, function(response)
       {
         if (response && response.active)
           document.body.classList.add("clickhide-active");
       });
     }
   });
 
   // Attach event listeners
@@ skipping 12 matching lines @@
     var collapser = collapsers[i];
     collapser.addEventListener("click", toggleCollapse, false);
     if (!Prefs[collapser.dataset.option])
       document.getElementById(collapser.dataset.collapsable).classList.add("collapsed");
   }
 }
 window.addEventListener("DOMContentLoaded", init, false);
 
 function toggleEnabled()
 {
-  var enabledButton = document.getElementById("enabled")
-  var disabled = enabledButton.classList.toggle("off");
+  var disabled = document.body.classList.toggle("disabled");
   if (disabled)
   {
     var host = getDecodedHostname(page.url).replace(/^www\./, "");
     var filter = Filter.fromText("@@||" + host + "^$document");
     if (filter.subscriptions.length && filter.disabled)
       filter.disabled = false;
     else
     {
       filter.disabled = false;
       FilterStorage.addFilter(filter);
@@ skipping 32 matching lines @@
   document.body.classList.remove("clickhide-active");
   page.sendMessage({type: "clickhide-deactivate"});
 }
 
 function toggleCollapse(event)
 {
   var collapser = event.currentTarget;
   Prefs[collapser.dataset.option] = !Prefs[collapser.dataset.option];
   collapser.parentNode.classList.toggle("collapsed");
 }