Remove redundant field initialization in Java code.

net/android/java/src/org/chromium/net/NetworkChangeNotifierAutoDetect.java

 // Copyright 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.net;
 
 import static android.net.ConnectivityManager.TYPE_VPN;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_INTERNET;
 import static android.net.NetworkCapabilities.NET_CAPABILITY_NOT_VPN;
 import static android.net.NetworkCapabilities.TRANSPORT_VPN;
@@ skipping 332 matching lines @@
     }
 
     // This class gets called back by ConnectivityManager whenever networks come
     // and go. It gets called back on a special handler thread
     // ConnectivityManager creates for making the callbacks. The callbacks in
     // turn post to the UI thread where mObserver lives.
     @TargetApi(Build.VERSION_CODES.LOLLIPOP)
     private class MyNetworkCallback extends NetworkCallback {
         // If non-null, this indicates a VPN is in place for the current user, and no other
         // networks are accessible.
-        private Network mVpnInPlace = null;
+        private Network mVpnInPlace;
 
         // Initialize mVpnInPlace.
         void initializeVpnInPlace() {
             final Network[] networks = getAllNetworksFiltered(mConnectivityManagerDelegate, null);
             mVpnInPlace = null;
             // If the filtered list of networks contains just a VPN, then that VPN is in place.
             if (networks.length == 1) {
                 final NetworkCapabilities capabilities =
                         mConnectivityManagerDelegate.getNetworkCapabilities(networks[0]);
                 if (capabilities != null && capabilities.hasTransport(TRANSPORT_VPN)) {
@@ skipping 623 matching lines @@
             return network.getNetworkHandle();
         } else {
             // NOTE(pauljensen): This depends on Android framework implementation details. These
             // details cannot change because Lollipop is long since released.
             // NetIDs are only 16-bit so use parseInt. This function returns a long because
             // getNetworkHandle() returns a long.
             return Integer.parseInt(network.toString());
         }
     }
 }