Fixes for some minor misc issues

- Unnecessary deprecation suppressions
- Dead code
- Broken Javadoc

PiperOrigin-RevId: 409357884

extensions/cast/src/test/java/com/google/android/exoplayer2/ext/cast/CastPlayerTest.java

@@ -392,7 +392,6 @@ public class CastPlayerTest {
     assertThat(mediaQueueItems[1].getMedia().getContentId()).isEqualTo(uri2);
   }
 
-  @SuppressWarnings("deprecation") // Verifies deprecated callback being called correctly.
   @Test
   public void setMediaItems_replaceExistingPlaylist_notifiesMediaItemTransition() {
     List<MediaItem> firstPlaylist = new ArrayList<>();

extensions/leanback/src/main/java/com/google/android/exoplayer2/ext/leanback/LeanbackPlayerAdapter.java

@@ -134,8 +134,6 @@ public final class LeanbackPlayerAdapter extends PlayerAdapter implements Runnab
     return player.getPlaybackState() == Player.STATE_IDLE ? -1 : player.getCurrentPosition();
   }
 
-  // Calls deprecated method to provide backwards compatibility.
-  @SuppressWarnings("deprecation")
   @Override
   public void play() {
     if (player.getPlaybackState() == Player.STATE_IDLE) {

library/common/src/main/java/com/google/android/exoplayer2/text/Cue.java

@@ -362,7 +362,6 @@ public final class Cue implements Bundleable {
    * @param textSize See {@link #textSize}.
    * @deprecated Use {@link Builder}.
    */
-  @SuppressWarnings("deprecation")
   @Deprecated
   public Cue(
       CharSequence text,

library/core/src/main/java/com/google/android/exoplayer2/DefaultLoadControl.java

@@ -262,7 +262,6 @@ public class DefaultLoadControl implements LoadControl {
   private boolean isLoading;
 
   /** Constructs a new instance, using the {@code DEFAULT_*} constants defined in this class. */
-  @SuppressWarnings("deprecation")
   public DefaultLoadControl() {
     this(
         new DefaultAllocator(true, C.DEFAULT_BUFFER_SEGMENT_SIZE),

library/core/src/main/java/com/google/android/exoplayer2/SimpleExoPlayer.java

@@ -396,7 +396,6 @@ public class SimpleExoPlayer extends BasePlayer
 
   /** @deprecated Use the {@link ExoPlayer.Builder}. */
   @Deprecated
-  @SuppressWarnings("deprecation")
   protected SimpleExoPlayer(
       Context context,
       RenderersFactory renderersFactory,
@@ -428,7 +427,6 @@ public class SimpleExoPlayer extends BasePlayer
   }
 
   /** @param builder The {@link ExoPlayer.Builder} to obtain all construction parameters. */
-  @SuppressWarnings("deprecation")
   /* package */ SimpleExoPlayer(ExoPlayer.Builder builder) {
     constructorFinished = new ConditionVariable();
     try {

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

@@ -1222,7 +1222,6 @@ public class PlayerControlView extends FrameLayout {
     }
   }
 
-  @SuppressWarnings("deprecation")
   private void dispatchPlay(Player player) {
     @State int state = player.getPlaybackState();
     if (state == Player.STATE_IDLE) {