Issue 4485 - Clear cache directory

src/org/adblockplus/sbrowser/contentblocker/engine/Subscriptions.java

 /*
  * 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 45 matching lines @@
     this.cacheFolder = cacheFolder;
   }
 
   public boolean wasUnitialized()
   {
     return this.wasUnitialized;
   }
 
   public File createAndWriteFile() throws IOException
   {
-    // TODO cache cleanups
     for (;;)
     {
       final File file = new File(this.cacheFolder, String.format("tmp-%d.txt",
           (int) (Math.random() * 1e8)));
       if (!file.exists())
       {
         Log.d(TAG, "Writing filters to " + file);
         this.writeFile(file);
         return file;
       }
@@ skipping 193 matching lines @@
     if (sub != null)
     {
       if (sub.updateSubscription(responseCode, text, httpHeaders, this.getMetaFile(sub),
           this.getFiltersFile(sub)))
       {
         this.engine.requestUpdateBroadcast();
       }
     }
   }
 }