Remove extra test checks intended to debug flaky test.

Those test are no longer flaky since the test clock
was made deterministic.

The removed assertions were introduced in https://github.com/google/ExoPlayer/commit/a4ad351fb15b60080ff53b345563e3f922464251.

PiperOrigin-RevId: 380793961

robolectricutils/src/main/java/com/google/android/exoplayer2/robolectric/TestPlayerRunHelper.java

@@ -17,7 +17,6 @@
 package com.google.android.exoplayer2.robolectric;
 
 import static com.google.android.exoplayer2.robolectric.RobolectricUtil.runMainLooperUntil;
-import static com.google.common.truth.Truth.assertThat;
 
 import android.os.Looper;
 import com.google.android.exoplayer2.ExoPlaybackException;
@@ -263,13 +262,7 @@ public class TestPlayerRunHelper {
           }
         };
     player.addAudioOffloadListener(listener);
-    runMainLooperUntil(
-        () -> { // Make sure progress is being made, see [internal: b/170387438#comment2]
-          assertThat(player.getPlayerError()).isNull();
-          assertThat(player.getPlayWhenReady()).isTrue();
-          assertThat(player.getPlaybackState()).isAnyOf(Player.STATE_BUFFERING, Player.STATE_READY);
-          return receiverCallback.get();
-        });
+    runMainLooperUntil(receiverCallback::get);
   }
 
   /**