Remove redundant field initialization in Java code.

android_webview/javatests/src/org/chromium/android_webview/test/AwContentsClientShouldInterceptRequestTest.java

 // Copyright 2012 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.test;
 
 import android.test.suitebuilder.annotation.SmallTest;
 import android.util.Pair;
 
 import org.chromium.android_webview.AwContents;
@@ skipping 25 matching lines @@
 
     private static class ShouldInterceptRequestClient extends TestAwContentsClient {
 
         public static class ShouldInterceptRequestHelper extends CallbackHelper {
             private List<String> mShouldInterceptRequestUrls = new ArrayList<String>();
             private ConcurrentHashMap<String, AwWebResourceResponse> mReturnValuesByUrls =
                     new ConcurrentHashMap<String, AwWebResourceResponse>();
             private ConcurrentHashMap<String, AwWebResourceRequest> mRequestsByUrls =
                     new ConcurrentHashMap<String, AwWebResourceRequest>();
             // This is read on another thread, so needs to be marked volatile.
-            private volatile AwWebResourceResponse mShouldInterceptRequestReturnValue = null;
+            private volatile AwWebResourceResponse mShouldInterceptRequestReturnValue;
             void setReturnValue(AwWebResourceResponse value) {
                 mShouldInterceptRequestReturnValue = value;
             }
             void setReturnValueForUrl(String url, AwWebResourceResponse value) {
                 mReturnValuesByUrls.put(url, value);
             }
             public List<String> getUrls() {
                 assert getCallCount() > 0;
                 return mShouldInterceptRequestUrls;
             }
@@ skipping 812 matching lines @@
         mAwContents = mTestContainerView.getAwContents();
         loadUrlAsync(mAwContents, "http://www.example.com");
         waitForShouldInterceptRequest.await();
         // The following call will try to send an IPC and wait for a reply from renderer.
         // We do not check the actual result, because it can be bogus. The important
         // thing is that the call does not cause a deadlock.
         executeJavaScriptAndWaitForResult(mAwContents, client, "1+1");
         signalAfterSendingIpc.countDown();
     }
 }