Remove opt-out for suppressing wrong thread usage error.

Enforcing the correct thread usage has been enabled since 2.13.0.
Opting-out of this enforement is dangerous as it can hide very hard
to debug bugs.

PiperOrigin-RevId: 424815808

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/ExoPlayer.java

@@ -1548,20 +1548,6 @@ public interface ExoPlayer extends Player {
   void setPriorityTaskManager(@Nullable PriorityTaskManager priorityTaskManager);
 
   /**
-   * Sets whether the player should throw an {@link IllegalStateException} when methods are called
-   * from a thread other than the one associated with {@link #getApplicationLooper()}.
-   *
-   * <p>The default is {@code true} and this method will be removed in the future.
-   *
-   * @param throwsWhenUsingWrongThread Whether to throw when methods are called from a wrong thread.
-   * @deprecated Disabling the enforcement can result in hard-to-detect bugs. Do not use this method
-   *     except to ease the transition while wrong thread access problems are fixed.
-   */
-  @UnstableApi
-  @Deprecated
-  void setThrowsWhenUsingWrongThread(boolean throwsWhenUsingWrongThread);
-
-  /**
    * Sets whether audio offload scheduling is enabled. If enabled, ExoPlayer's main loop will run as
    * rarely as possible when playing an audio stream using audio offload.
    *

libraries/exoplayer/src/main/java/androidx/media3/exoplayer/SimpleExoPlayer.java

@@ -1552,9 +1552,7 @@ public class SimpleExoPlayer extends BasePlayer
     streamVolumeManager.setMuted(muted);
   }
 
-  @Deprecated
-  @Override
-  public void setThrowsWhenUsingWrongThread(boolean throwsWhenUsingWrongThread) {
+  /* package */ void setThrowsWhenUsingWrongThread(boolean throwsWhenUsingWrongThread) {
     this.throwsWhenUsingWrongThread = throwsWhenUsingWrongThread;
   }
 

libraries/test_utils/src/main/java/androidx/media3/test/utils/StubExoPlayer.java

@@ -359,12 +359,6 @@ public class StubExoPlayer extends StubPlayer implements ExoPlayer {
     throw new UnsupportedOperationException();
   }
 
-  @Deprecated
-  @Override
-  public void setThrowsWhenUsingWrongThread(boolean throwsWhenUsingWrongThread) {
-    throw new UnsupportedOperationException();
-  }
-
   @Override
   public void experimentalSetOffloadSchedulingEnabled(boolean offloadSchedulingEnabled) {
     throw new UnsupportedOperationException();