Remove redundant field initialization in Java code.

chrome/test/android/javatests/src/org/chromium/chrome/test/util/ChromeSigninUtils.java

 // Copyright 2015 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.test.util;
 
 import android.accounts.Account;
 import android.accounts.AccountManager;
 import android.accounts.AccountManagerCallback;
 import android.accounts.AccountManagerFuture;
@@ skipping 160 matching lines @@
     /**
      * Helper class for adding Google accounts to OS.
      *
      * Usage: Use this as the callback parameter when using {@link addAccount} in
      * {@link android.accounts.AccountManager}.
      */
     private static class AuthenticationCallback implements AccountManagerCallback<Bundle> {
         private final Object mAuthenticationCompletionLock = new Object();
 
         /** Stores the result of account authentication. Null means not finished. */
-        private Bundle mResultBundle = null;
+        private Bundle mResultBundle;
 
         /**
          * Block and wait for the authentication callback to complete.
          *
          * @return the {@link Bundle} result from the authentication.
          */
         public Bundle waitForAuthCompletion() {
             synchronized (mAuthenticationCompletionLock) {
                 while (mResultBundle == null) {
                     try {
@@ skipping 32 matching lines @@
          */
         private Bundle buildExceptionBundle(Exception e) {
             Bundle bundle = new Bundle();
             bundle.putInt(AccountManager.KEY_ERROR_CODE,
                     AccountManager.ERROR_CODE_INVALID_RESPONSE);
             bundle.putString(AccountManager.KEY_ERROR_MESSAGE, e.toString());
             return bundle;
         }
     }
 }