Issue 4813 - UTFDataFormatException while serializing filter

src/org/adblockplus/sbrowser/contentblocker/engine/Downloader.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 84 matching lines @@
       if (key == null)
       {
         break;
       }
       final String value = connection.getHeaderField(i);
       job.responseHeaders.put(key.toLowerCase(), value);
     }
 
     final StringBuilder sb = new StringBuilder();
     final BufferedReader r = new BufferedReader(new InputStreamReader(connection.getInputStream(),
-        "UTF-8"));
+        Engine.CHARSET_UTF_8));
     try
     {
       for (int ch = r.read(); ch != -1; ch = r.read())
       {
         sb.append((char) ch);
       }
       job.responseText = sb.toString();
     }
     finally
     {
@@ skipping 144 matching lines @@
     {
       this.url = url;
       this.id = id;
       if (headers != null)
       {
         this.headers.putAll(headers);
       }
     }
   }
 }