Remove redundant field initialization in Java code.

net/test/android/javatests/src/org/chromium/net/test/DummySpnegoAuthenticatorService.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.test;
 
 import android.app.Service;
 import android.content.Intent;
 import android.os.IBinder;
 
 /**
  * Authenticator service for testing SPNEGO (Kerberos) support.
  */
 public class DummySpnegoAuthenticatorService extends Service {
-    private static DummySpnegoAuthenticator sAuthenticator = null;
+    private static DummySpnegoAuthenticator sAuthenticator;
 
     @Override
     public IBinder onBind(Intent arg0) {
         if (sAuthenticator == null) sAuthenticator = new DummySpnegoAuthenticator(this);
         return sAuthenticator.getIBinder();
     }
 }