Remove redundant field initialization in Java code.

base/android/java/src/org/chromium/base/metrics/RecordUserAction.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.base.metrics;
 
 import org.chromium.base.ThreadUtils;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.base.annotations.JNINamespace;
 
 /**
  * Java API for recording UMA actions.
  *
  * WARNINGS:
  * JNI calls are relatively costly - avoid using in performance-critical code.
  *
  * We use a script (extract_actions.py) to scan the source code and extract actions. A string
  * literal (not a variable) must be passed to record().
  */
 @JNINamespace("base::android")
 public class RecordUserAction {
-    private static boolean sIsDisabledForTests = false;
+    private static boolean sIsDisabledForTests;
 
     /**
      * Tests may not have native initialized, so they may need to disable metrics.
      */
     @VisibleForTesting
     public static void disableForTests() {
         sIsDisabledForTests = true;
     }
 
     public static void record(final String action) {
         if (sIsDisabledForTests) return;
 
         if (ThreadUtils.runningOnUiThread()) {
             nativeRecordUserAction(action);
             return;
         }
 
         ThreadUtils.runOnUiThread(new Runnable() {
             @Override
             public void run() {
                 nativeRecordUserAction(action);
             }
         });
     }
 
     private static native void nativeRecordUserAction(String action);
 }