Make getRendererEnabled behavior the same as it used to be, until it's removed.

library/src/main/java/com/google/android/exoplayer/ExoPlayer.java

@@ -300,10 +300,9 @@ public interface ExoPlayer {
   /**
    * Whether the renderer at the given index is enabled.
    *
-   * @deprecated Use {@code getSelectedTrack(rendererIndex)}. A return value between 0 (inclusive)
+   * @deprecated Use {@code getSelectedTrack(rendererIndex)}. A non-negative return value from that
-   *      and {@code getTrackCount(rendererIndex)} (exclusive) indicate the renderer is enabled. A
+   *     method is equivalent to this method returning true. A negative return value is equivalent
-   *      value outside of this range (e.g. {@link #TRACK_DISABLED}) indicates that the renderer is
+   *     to this method returning false.
-   *      disabled.
    * @param rendererIndex The index of the renderer.
    * @return Whether the renderer is enabled.
    */

library/src/main/java/com/google/android/exoplayer/ExoPlayerImpl.java

@@ -111,8 +111,7 @@ import java.util.concurrent.CopyOnWriteArraySet;
   @Deprecated
   @Override
   public boolean getRendererEnabled(int rendererIndex) {
-    int selectedTrack = getSelectedTrack(rendererIndex);
+    return getSelectedTrack(rendererIndex) >= 0;
-    return 0 <= selectedTrack && selectedTrack < getTrackCount(rendererIndex);
   }
 
   @Override