Remove redundant field initialization in Java code.

chrome/android/java/src/org/chromium/chrome/browser/invalidation/ChromeBrowserSyncAdapterService.java

 // Copyright 2013 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.invalidation;
 
 import android.app.Service;
 import android.content.Context;
 import android.content.Intent;
 import android.os.IBinder;
 
 import org.chromium.chrome.browser.init.ProcessInitializationHandler;
 
 /**
  * A Service that provides access to {@link ChromeBrowserSyncAdapter}.
  */
 public class ChromeBrowserSyncAdapterService extends Service {
-    private static ChromeBrowserSyncAdapter sSyncAdapter = null;
+    private static ChromeBrowserSyncAdapter sSyncAdapter;
     private static final Object LOCK = new Object();
 
     /**
      * Get the sync adapter reference, creating an instance if necessary.
      */
     private ChromeBrowserSyncAdapter getOrCreateSyncAdapter(Context applicationContext) {
         synchronized (LOCK) {
             if (sSyncAdapter == null) {
                 ProcessInitializationHandler.getInstance().initializePreNative();
                 sSyncAdapter = new ChromeBrowserSyncAdapter(applicationContext, getApplication());
             }
         }
         return sSyncAdapter;
     }
 
     @Override
     public IBinder onBind(Intent intent) {
         return getOrCreateSyncAdapter(getApplicationContext()).getSyncAdapterBinder();
     }
 }