[Cronet] Change interface APIs to abstract classes

components/cronet/android/test/javatests/src/org/chromium/net/GetStatusTest.java

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.net;
 
 import android.os.ConditionVariable;
 import android.test.suitebuilder.annotation.SmallTest;
 
 import org.chromium.base.test.util.Feature;
 import org.chromium.net.TestUrlRequestListener.ResponseStep;
 
 /**
  * Tests that {@link CronetUrlRequest#getStatus} works as expected.
  */
 public class GetStatusTest extends CronetTestBase {
     private CronetTestActivity mActivity;
 
-    private static class TestStatusListener implements StatusListener {
+    private static class TestStatusListener extends StatusListener {
         boolean mOnStatusCalled = false;
         int mStatus = Integer.MAX_VALUE;
         private final ConditionVariable mBlock = new ConditionVariable();
 
         @Override
         public void onStatus(int status) {
             mOnStatusCalled = true;
             mStatus = status;
             mBlock.open();
         }
@@ skipping 92 matching lines @@
 
         try {
             RequestStatus.convertLoadState(16);
             fail();
         } catch (AssertionError e) {
             // Expected.
         }
     }
 
 }