modify getWebViewClient behavior

android_webview/glue/java/src/com/android/webview/chromium/WebViewContentsClientAdapter.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 com.android.webview.chromium;
 
 import android.annotation.SuppressLint;
 import android.annotation.TargetApi;
 import android.content.Context;
 import android.graphics.Bitmap;
@@ skipping 154 matching lines @@
 
     void setWebViewClient(WebViewClient client) {
         if (client != null) {
             mWebViewClient = client;
         } else {
             mWebViewClient = sNullWebViewClient;
         }
     }
 
     WebViewClient getWebViewClient() {
-        // If this hasn't been set yet, return null instead of exposing sNullWebViewClient
-        return mWebViewClient == sNullWebViewClient ? null : mWebViewClient;
+        return mWebViewClient;
     }
 
     void setWebChromeClient(WebChromeClient client) {
         mWebChromeClient = client;
     }
 
     WebChromeClient getWebChromeClient() {
         return mWebChromeClient;
     }
 
@@ skipping 1118 matching lines @@
                 mAwPermissionRequest.deny();
             }
         }
 
         @Override
         public void deny() {
             mAwPermissionRequest.deny();
         }
     }
 }