Remove redundant field initialization in Java code.

chrome/android/java/src/org/chromium/chrome/browser/media/remote/CastNotificationControl.java

 // Copyright 2016 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.media.remote;
 
 import android.content.Context;
 import android.content.Intent;
 import android.graphics.Bitmap;
 import android.media.AudioManager;
@@ skipping 13 matching lines @@
 /**
  * Notification control controls the cast notification and lock screen, using
  * {@link MediaNotificationManager}
  */
 public class CastNotificationControl implements MediaRouteController.UiListener,
         MediaNotificationListener, AudioManager.OnAudioFocusChangeListener {
 
     private static CastNotificationControl sInstance;
 
     private Bitmap mPosterBitmap;
-    protected MediaRouteController mMediaRouteController = null;
+    protected MediaRouteController mMediaRouteController;
     private MediaNotificationInfo.Builder mNotificationBuilder;
     private Context mContext;
     private PlayerState mState;
     private String mTitle = "";
     private AudioManager mAudioManager;
 
-    private boolean mIsShowing = false;
+    private boolean mIsShowing;
 
     private static final Object LOCK = new Object();
 
 
     private CastNotificationControl(Context context) {
         mContext = context;
         mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
     }
     /**
      * Get the unique NotificationControl, creating it if necessary.
@@ skipping 177 matching lines @@
     @VisibleForTesting
     static CastNotificationControl getForTests() {
         return sInstance;
     }
 
     @VisibleForTesting
     boolean isShowingForTests() {
         return mIsShowing;
     }
 }