Remove redundant field initialization in Java code.

android_webview/java/src/org/chromium/android_webview/AwDevToolsServer.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.android_webview;
 
 import org.chromium.base.annotations.JNINamespace;
 
 /**
  * Controller for Remote Web Debugging (Developer Tools).
  */
 @JNINamespace("android_webview")
 public class AwDevToolsServer {
 
-    private long mNativeDevToolsServer = 0;
+    private long mNativeDevToolsServer;
 
     public AwDevToolsServer() {
         mNativeDevToolsServer = nativeInitRemoteDebugging();
     }
 
     public void destroy() {
         nativeDestroyRemoteDebugging(mNativeDevToolsServer);
         mNativeDevToolsServer = 0;
     }
 
     public void setRemoteDebuggingEnabled(boolean enabled) {
         nativeSetRemoteDebuggingEnabled(mNativeDevToolsServer, enabled);
     }
 
     private native long nativeInitRemoteDebugging();
     private native void nativeDestroyRemoteDebugging(long devToolsServer);
     private native void nativeSetRemoteDebuggingEnabled(long devToolsServer, boolean enabled);
 }