Don't implement Player.Listener from SubtitleView

We never register SubtitleView as a Player.Listener directly, it's
always done via PlayerView.

PiperOrigin-RevId: 447467037

library/ui/src/main/java/com/google/android/exoplayer2/ui/SubtitleView.java

@@ -31,7 +31,6 @@ import android.widget.FrameLayout;
 import androidx.annotation.Dimension;
 import androidx.annotation.IntDef;
 import androidx.annotation.Nullable;
-import com.google.android.exoplayer2.Player;
 import com.google.android.exoplayer2.text.Cue;
 import com.google.android.exoplayer2.util.Util;
 import java.lang.annotation.Documented;
@@ -42,7 +41,7 @@ import java.util.Collections;
 import java.util.List;
 
 /** A view for displaying subtitle {@link Cue}s. */
-public final class SubtitleView extends FrameLayout implements Player.Listener {
+public final class SubtitleView extends FrameLayout {
 
   /**
    * An output for displaying subtitles.
@@ -150,11 +149,6 @@ public final class SubtitleView extends FrameLayout implements Player.Listener {
     viewType = VIEW_TYPE_CANVAS;
   }
 
-  @Override
-  public void onCues(List<Cue> cues) {
-    setCues(cues);
-  }
-
   /**
    * Sets the cues to be displayed by the view.
    *