Issue 3705 - Don't rely on info.platform when checking for availability of the chrome.* API

lib/prefs.js

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-2016 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 218 matching lines @@
     ext.storage.get(prefs.map(prefToKey), function(items)
     {
       for (let key in items)
         overrides[keyToPref(key)] = items[key];
 
       resolve();
     });
   });
 
   let managedLoaded = new Promise(resolve => {
-    if (require("info").platform == "chromium" && "managed" in chrome.storage)
+    if (typeof chrome == "object" && "managed" in chrome.storage)
     {
       chrome.storage.managed.get(null, function(items)
       {
         // Opera doesn't support chrome.storage.managed, but instead simply
         // removing the API, Opera sets chrome.runtime.lastError when using it.
         // So we have to retrieve that error, to prevent it from showing up
         // in the console.
         chrome.runtime.lastError;
 
         for (let key in items)
@@ skipping 26 matching lines @@
           Prefs.onChanged._dispatch(pref);
         }
       }
     });
   }
 
   Prefs.isLoaded = Promise.all([localLoaded, managedLoaded]).then(onLoaded);
 }
 
 init();