Remove native side of content_view_client

android_webview/javatests/src/org/chromium/android_webview/test/NullContentsClient.java

 // Copyright (c) 2012 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.android_webview.test;
 
 import android.view.KeyEvent;
 import android.webkit.ConsoleMessage;
 
 import org.chromium.android_webview.AwContentsClient;
@@ skipping 19 matching lines @@
 
     @Override
     public boolean onConsoleMessage(ConsoleMessage consoleMessage) {
         return false;
     }
 
     @Override
     public void onReceivedHttpAuthRequest(AwHttpAuthHandler handler, String host, String realm) {
         handler.cancel();
     }
+
+    @Override
+    public void onPageStarted(String url) {
+    }
+
+    @Override
+    public void onPageFinished(String url) {
+    }
+
+    @Override
+    public void onReceivedError(int errorCode, String description, String failingUrl) {
+    }
 };