Remove redundant field initialization in Java code.

chrome/android/java/src/org/chromium/chrome/browser/autofill/AutofillLogger.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.chrome.browser.autofill;
 
 import org.chromium.base.VisibleForTesting;
 import org.chromium.base.annotations.CalledByNative;
 import org.chromium.base.annotations.JNINamespace;
 
@@ skipping 26 matching lines @@
     }
 
     /**
      * A logger interface. Uses LogItem instead of individual fields to allow
      * changing the items that are logged without breaking the embedder.
      */
     public interface Logger {
         public void didFillField(LogEntry logItem);
     }
 
-    private static Logger sLogger = null;
-    private static Logger sLoggerForTest = null;
+    private static Logger sLogger;
+    private static Logger sLoggerForTest;
 
     @VisibleForTesting
     public static void setLogger(Logger logger) {
         sLogger = logger;
     }
 
     @VisibleForTesting
     public static void setLoggerForTesting(Logger logger) {
         sLoggerForTest = logger;
     }
 
     @CalledByNative
     private static void didFillField(String autofilledValue, String profileFullName) {
         if (sLogger != null) {
             sLogger.didFillField(new LogEntry(autofilledValue, profileFullName));
         }
 
         if (sLoggerForTest != null) {
             sLoggerForTest.didFillField(new LogEntry(autofilledValue, profileFullName));
         }
     }
 }