Remove deprecated usage of MediaSession APIs

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=209152304

extensions/cast/src/main/java/com/google/android/exoplayer2/ext/cast/CastPlayer.java

@@ -839,7 +839,6 @@ public final class CastPlayer implements Player {
     @Override
     public void onAdBreakStatusUpdated() {}
 
-
     // SessionManagerListener implementation.
 
     @Override

extensions/mediasession/src/main/java/com/google/android/exoplayer2/ext/mediasession/MediaSessionConnector.java

@@ -248,8 +248,6 @@ public final class MediaSessionConnector {
      * description)}.
      */
     void onRemoveQueueItem(Player player, MediaDescriptionCompat description);
-    /** See {@link MediaSessionCompat.Callback#onRemoveQueueItemAt(int index)}. */
-    void onRemoveQueueItemAt(Player player, int index);
   }
 
   /** Callback receiving a user rating for the active media item. */
@@ -1022,12 +1020,5 @@ public final class MediaSessionConnector {
         queueEditor.onRemoveQueueItem(player, description);
       }
     }
-
-    @Override
-    public void onRemoveQueueItemAt(int index) {
-      if (queueEditor != null) {
-        queueEditor.onRemoveQueueItemAt(player, index);
-      }
-    }
   }
 }

extensions/mediasession/src/main/java/com/google/android/exoplayer2/ext/mediasession/TimelineQueueEditor.java

@@ -184,18 +184,13 @@ public final class TimelineQueueEditor
     List<MediaSessionCompat.QueueItem> queue = mediaController.getQueue();
     for (int i = 0; i < queue.size(); i++) {
       if (equalityChecker.equals(queue.get(i).getDescription(), description)) {
-        onRemoveQueueItemAt(player, i);
+        queueDataAdapter.remove(i);
+        queueMediaSource.removeMediaSource(i);
         return;
       }
     }
   }
 
-  @Override
-  public void onRemoveQueueItemAt(Player player, int index) {
-    queueDataAdapter.remove(index);
-    queueMediaSource.removeMediaSource(index);
-  }
-
   // CommandReceiver implementation.
 
   @NonNull