Remove redundant field initialization in Java code.

chrome/android/java/src/org/chromium/chrome/browser/signin/AccountManagementFragment.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.browser.signin;
 
 import android.accounts.Account;
 import android.annotation.TargetApi;
 import android.app.Activity;
 import android.app.Dialog;
@@ skipping 82 matching lines @@
     /**
      * SharedPreference name for the preference that disables signing out of Chrome.
      * Signing out is forever disabled once Chrome signs the user in automatically
      * if the device has a child account or if the device is an Android EDU device.
      */
     private static final String SIGN_OUT_ALLOWED = "auto_signed_in_school_account";
 
     private static final HashMap<String, Pair<String, Bitmap>> sToNamePicture =
             new HashMap<String, Pair<String, Bitmap>>();
 
-    private static String sChildAccountId = null;
-    private static Bitmap sCachedBadgedPicture = null;
+    private static String sChildAccountId;
+    private static Bitmap sCachedBadgedPicture;
 
     public static final String PREF_SIGN_OUT = "sign_out";
     public static final String PREF_ADD_ACCOUNT = "add_account";
     public static final String PREF_PARENTAL_SETTINGS = "parental_settings";
     public static final String PREF_PARENT_ACCOUNTS = "parent_accounts";
     public static final String PREF_CHILD_CONTENT = "child_content";
     public static final String PREF_CHILD_SAFE_SITES = "child_safe_sites";
     public static final String PREF_GOOGLE_ACTIVITY_CONTROLS = "google_activity_controls";
     public static final String PREF_SYNC_SETTINGS = "sync_settings";
 
@@ skipping 610 matching lines @@
      * @param context A context
      * @param isAllowed True if the sign out is not disabled due to a child/EDU account
      */
     public static void setSignOutAllowedPreferenceValue(Context context, boolean isAllowed) {
         ContextUtils.getAppSharedPreferences()
                 .edit()
                 .putBoolean(SIGN_OUT_ALLOWED, isAllowed)
                 .apply();
     }
 }