Update browseable for MediaBrowserService.

Change-Id: Iadb01b70091b9102a8445cd1fe1e1d974127e88f
diff --git a/samples/browseable/MediaBrowserService/src/com.example.android.mediabrowserservice/MusicPlayerActivity.java b/samples/browseable/MediaBrowserService/src/com.example.android.mediabrowserservice/MusicPlayerActivity.java
index 648d268..394b01a 100644
--- a/samples/browseable/MediaBrowserService/src/com.example.android.mediabrowserservice/MusicPlayerActivity.java
+++ b/samples/browseable/MediaBrowserService/src/com.example.android.mediabrowserservice/MusicPlayerActivity.java
@@ -17,7 +17,6 @@
 
 import android.app.Activity;
 import android.media.browse.MediaBrowser;
-import android.media.session.MediaController;
 import android.os.Bundle;
 
 /**
@@ -28,9 +27,6 @@
 
     private static final String TAG = MusicPlayerActivity.class.getSimpleName();
 
-    private MediaBrowser mMediaBrowser;
-    private MediaController mMediaController;
-
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);