Remove TODO from `ControllerInfo` - the existing approach is fine

PiperOrigin-RevId: 496398934
(cherry picked from commit 14947539)

libraries/session/src/main/java/androidx/media3/session/MediaSession.java

@@ -504,7 +504,6 @@ public class MediaSession {
           /* connectionHints= */ Bundle.EMPTY);
           /* connectionHints= */ Bundle.EMPTY);
     }
     }
 
 
-    // TODO(b/259546357): Remove when ControllerInfo can be instantiated cleanly in tests.
     /** Returns a {@link ControllerInfo} suitable for use when testing client code. */
     /** Returns a {@link ControllerInfo} suitable for use when testing client code. */
     @VisibleForTesting(otherwise = PRIVATE)
     @VisibleForTesting(otherwise = PRIVATE)
     public static ControllerInfo createTestOnlyControllerInfo(
     public static ControllerInfo createTestOnlyControllerInfo(