Issue 3446 - Remove code migrating prefs and files to chrome.storage

lib/prefs.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 235 matching lines @@
             delete overrides[pref];
 
           Prefs.onChanged._dispatch(pref);
         }
       }
     });
 
     Prefs.onLoaded._dispatch();
   };
 
-  // Migrate preferences for users updating from old versions.
-  // TODO: Remove the migration code after a few releases.
-  ext.storage.migratePrefs({
-    map: function(key, value)
-    {
-      if (key in defaults || key == "stats_total")
-      {
-        if (key != "currentVersion")
-        {
-          try
-          {
-            value = JSON.parse(value);
-          }
-          catch (e)
-          {
-            return null;
-          }
-        }
+  ext.storage.get(prefs.map(prefToKey), function(items)
+  {
+    for (let key in items)
+      overrides[keyToPref(key)] = items[key];
 
-        if (key == "stats_total")
-        {
-          key = "blocked_total";
-          value = value.blocked;
-        }
-
-        return {key: prefToKey(key), value: value};
-      }
-
-      return null;
-    },
-
-    done: function()
-    {
-      ext.storage.get(prefs.map(prefToKey), function(items)
-      {
-        for (let key in items)
-          overrides[keyToPref(key)] = items[key];
-
-        localLoaded = true;
-        checkLoaded();
-      });
-    }
+    localLoaded = true;
+    checkLoaded();
   });
 
   if (require("info").platform == "chromium" && "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)
         defaults[key] = items[key];
 
       managedLoaded = true;
       checkLoaded();
     });
   }
   else
   {
     managedLoaded = true;
     checkLoaded();
   }
 }
 
 init();