Remove redundant field initialization in Java code.

ui/android/java/src/org/chromium/ui/base/ActivityWindowAndroid.java

 // Copyright 2013 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.ui.base;
 
 import android.app.Activity;
 import android.app.PendingIntent;
 import android.content.ActivityNotFoundException;
 import android.content.Context;
@@ skipping 29 matching lines @@
         implements ApplicationStatus.ActivityStateListener, View.OnLayoutChangeListener {
     // Constants used for intent request code bounding.
     private static final int REQUEST_CODE_PREFIX = 1000;
     private static final int REQUEST_CODE_RANGE_SIZE = 100;
 
     private static final String PERMISSION_QUERIED_KEY_PREFIX = "HasRequestedAndroidPermission::";
 
     private final Handler mHandler;
     private final SparseArray<PermissionCallback> mOutstandingPermissionRequests;
 
-    private int mNextRequestCode = 0;
+    private int mNextRequestCode;
 
     /**
      * Creates an Activity-specific WindowAndroid with associated intent functionality.
      * TODO(jdduke): Remove this overload when all callsites have been updated to
      * indicate their activity state listening preference.
      * @param context Context wrapping an activity associated with the WindowAndroid.
      */
     public ActivityWindowAndroid(Context context) {
         this(context, true);
     }
@@ skipping 271 matching lines @@
             Activity activity = getActivity().get();
             if (activity == null) return false;
 
             int requestCode = generateNextRequestCode();
             mOutstandingPermissionRequests.put(requestCode, callback);
             activity.requestPermissions(permissions, requestCode);
             return true;
         }
     }
 }