Remove redundant field initialization in Java code.

mojo/public/java/bindings/src/org/chromium/mojo/bindings/Message.java

 // Copyright 2014 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.mojo.bindings;
 
 import org.chromium.mojo.system.Handle;
 import org.chromium.mojo.system.MessagePipeHandle;
 
 import java.nio.ByteBuffer;
@@ skipping 11 matching lines @@
     private final ByteBuffer mBuffer;
 
     /**
      * The handles of the message.
      */
     private final List<? extends Handle> mHandle;
 
     /**
      * This message interpreted as a message for a mojo service with an appropriate header.
      */
-    private ServiceMessage mWithHeader = null;
+    private ServiceMessage mWithHeader;
 
     /**
      * Constructor.
      *
      * @param buffer The buffer containing the bytes to send. This must be a direct buffer.
      * @param handles The list of handles to send.
      */
     public Message(ByteBuffer buffer, List<? extends Handle> handles) {
         assert buffer.isDirect();
         mBuffer = buffer;
@@ skipping 17 matching lines @@
     /**
      * Returns the message interpreted as a message for a mojo service.
      */
     public ServiceMessage asServiceMessage() {
         if (mWithHeader == null) {
             mWithHeader = new ServiceMessage(this);
         }
         return mWithHeader;
     }
 }