Remove redundant field initialization in Java code.

components/sync/android/java/src/org/chromium/components/sync/AndroidSyncSettings.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.components.sync;
 
 import android.accounts.Account;
 import android.content.ContentResolver;
 import android.content.Context;
 import android.content.SyncStatusObserver;
@@ skipping 31 matching lines @@
     private static AndroidSyncSettings sInstance;
 
     private final Object mLock = new Object();
 
     private final String mContractAuthority;
 
     private final Context mApplicationContext;
 
     private final SyncContentResolverDelegate mSyncContentResolverDelegate;
 
-    private Account mAccount = null;
+    private Account mAccount;
 
-    private boolean mIsSyncable = false;
+    private boolean mIsSyncable;
 
-    private boolean mChromeSyncEnabled = false;
+    private boolean mChromeSyncEnabled;
 
-    private boolean mMasterSyncEnabled = false;
+    private boolean mMasterSyncEnabled;
 
     private final ObserverList<AndroidSyncSettingsObserver> mObservers =
             new ObserverList<AndroidSyncSettingsObserver>();
 
     /**
      * Provides notifications when Android sync settings have changed.
      */
     public interface AndroidSyncSettingsObserver { public void androidSyncSettingsChanged(); }
 
     private static void ensureInitialized(Context context) {
@@ skipping 229 matching lines @@
     private void notifyObservers() {
         for (AndroidSyncSettingsObserver observer : mObservers) {
             observer.androidSyncSettingsChanged();
         }
     }
 
     private String getContractAuthority() {
         return mApplicationContext.getPackageName();
     }
 }