Migrate callers of ExoPlayer.Builder#build() to buildExoPlayer()

An upcoming change will update build() to return Player.

PiperOrigin-RevId: 399981901

demos/cast/src/main/java/com/google/android/exoplayer2/castdemo/PlayerManager.java

@@ -90,7 +90,7 @@ import java.util.ArrayList;
     currentItemIndex = C.INDEX_UNSET;
 
     trackSelector = new DefaultTrackSelector(context);
-    exoPlayer = new ExoPlayer.Builder(context).setTrackSelector(trackSelector).build();
+    exoPlayer = new ExoPlayer.Builder(context).setTrackSelector(trackSelector).buildExoPlayer();
     exoPlayer.addListener(this);
     localPlayerView.setPlayer(exoPlayer);
 

demos/main/src/main/java/com/google/android/exoplayer2/demo/PlayerActivity.java

@@ -278,7 +278,7 @@ public class PlayerActivity extends AppCompatActivity
           new ExoPlayer.Builder(/* context= */ this, renderersFactory)
               .setMediaSourceFactory(mediaSourceFactory)
               .setTrackSelector(trackSelector)
-              .build();
+              .buildExoPlayer();
       player.addListener(new PlayerEventListener());
       player.addAnalyticsListener(new EventLogger(trackSelector));
       player.setAudioAttributes(AudioAttributes.DEFAULT, /* handleAudioFocus= */ true);