Remove redundant field initialization in Java code.

chrome/android/java/src/org/chromium/chrome/browser/physicalweb/PhysicalWebBleClient.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.chrome.browser.physicalweb;
 
 import android.app.Activity;
 
 import com.google.android.gms.common.api.GoogleApiClient;
 import com.google.android.gms.nearby.Nearby;
 import com.google.android.gms.nearby.messages.Message;
 import com.google.android.gms.nearby.messages.MessageFilter;
 import com.google.android.gms.nearby.messages.MessageListener;
 
 import org.chromium.base.ContextUtils;
 import org.chromium.base.Log;
 import org.chromium.chrome.browser.ChromeApplication;
 
 
 /**
  * The Client that harvests URLs from BLE signals.
  * This class is designed to scan URSs from Bluetooth Low Energy beacons.
  * This class is currently an empty implementation and must be extended by a
  * subclass.
  */
 public class PhysicalWebBleClient {
-    private static PhysicalWebBleClient sInstance = null;
+    private static PhysicalWebBleClient sInstance;
     private static final String TAG = "PhysicalWeb";
 
     // We don't actually listen to any of the onFound or onLost events in the foreground.
     // The background listener will get these.
     protected static class ForegroundMessageListener extends MessageListener {
         @Override
         public void onFound(Message message) {}
     }
 
     protected static class BackgroundMessageListener extends MessageListener {
@@ skipping 121 matching lines @@
 
     /**
      * Modify a MessageFilter.Builder as necessary for doing Physical Web scanning.
      * @param builder The builder to be modified.
      * @return The Builder.
      */
     MessageFilter.Builder modifyMessageFilterBuilder(MessageFilter.Builder builder) {
         return builder.includeAllMyTypes();
     }
 }