Remove dead code

PiperOrigin-RevId: 274848191

demos/gvr/src/main/java/com/google/android/exoplayer2/gvrdemo/PlayerActivity.java

@@ -24,7 +24,6 @@ import com.google.android.exoplayer2.C;
 import com.google.android.exoplayer2.C.ContentType;
 import com.google.android.exoplayer2.C.ContentType;
 import com.google.android.exoplayer2.DefaultRenderersFactory;
 import com.google.android.exoplayer2.DefaultRenderersFactory;
 import com.google.android.exoplayer2.ExoPlaybackException;
 import com.google.android.exoplayer2.ExoPlaybackException;
-import com.google.android.exoplayer2.PlaybackPreparer;
 import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.SimpleExoPlayer;
 import com.google.android.exoplayer2.SimpleExoPlayer;
 import com.google.android.exoplayer2.ext.gvr.GvrPlayerActivity;
 import com.google.android.exoplayer2.ext.gvr.GvrPlayerActivity;
@@ -44,7 +43,7 @@ import com.google.android.exoplayer2.util.EventLogger;
 import com.google.android.exoplayer2.util.Util;
 import com.google.android.exoplayer2.util.Util;
 
 
 /** An activity that plays media using {@link SimpleExoPlayer}. */
 /** An activity that plays media using {@link SimpleExoPlayer}. */
-public class PlayerActivity extends GvrPlayerActivity implements PlaybackPreparer {
+public class PlayerActivity extends GvrPlayerActivity {
 
 
   public static final String EXTENSION_EXTRA = "extension";
   public static final String EXTENSION_EXTRA = "extension";
 
 
@@ -108,18 +107,6 @@ public class PlayerActivity extends GvrPlayerActivity implements PlaybackPrepare
     }
     }
   }
   }
 
 
-  @Override
-  public void onDestroy() {
-    super.onDestroy();
-  }
-
-  // PlaybackControlView.PlaybackPreparer implementation
-
-  @Override
-  public void preparePlayback() {
-    initializePlayer();
-  }
-
   // Internal methods
   // Internal methods
 
 
   private void initializePlayer() {
   private void initializePlayer() {