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

libadblockplus-android-tests/src/org/adblockplus/libadblockplus/tests/MockWebRequestTest.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
@@ skipping 12 matching lines @@
 import org.adblockplus.libadblockplus.WebRequest;
 
 import org.junit.Test;
 
 import java.util.Arrays;
 import java.util.List;
 
 public class MockWebRequestTest extends BaseJsTest
 {
 
-  private class LocalMockWebRequest extends WebRequest
+  private class LocalMockWebRequest implements WebRequest
   {
     @Override
     public ServerResponse httpGET(String url, List<HeaderEntry> headers)
     {
       try
       {
         Thread.sleep(50);
       }
       catch (InterruptedException e)
       {
@@ skipping 94 matching lines @@
 
     assertEquals(
       ServerResponse.NsStatus.OK.getStatusCode(),
       jsEngine.evaluate("foo.status").asLong());
     assertEquals("http://example.com/\nX\nY", jsEngine.evaluate("foo.responseText").asString());
     assertEquals("{\"Foo\":\"Bar\"}",
       jsEngine.evaluate("JSON.stringify(foo.responseHeaders)").asString());
   }
 
 }