Issue 5556 - make C++ implementation of LogSystem manageable only by JsEngine

libadblockplus-android-tests/src/org/adblockplus/libadblockplus/ThrowingLogSystem.java

 /*
  * This file is part of Adblock Plus <https://adblockplus.org/>,
  * Copyright (C) 2006-present 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
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
  */
 
 package org.adblockplus.libadblockplus;
 
-public class ThrowingLogSystem extends LogSystem
+public class ThrowingLogSystem implements LogSystem
 {
   @Override
   public void logCallback(LogLevel level, String message, String source)
   {
     throw new RuntimeException("Unexpected error: " + message);
   }
 }