remove redundant @nonnull annotation

Author: marcbaechinger

libraries/cast/src/main/java/androidx/media3/cast/CastPlayer.java

@@ -34,7 +34,6 @@
 import android.view.SurfaceView;
 import android.view.TextureView;
 import androidx.annotation.IntRange;
-import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
 import androidx.annotation.RequiresApi;
 import androidx.annotation.VisibleForTesting;
@@ -774,7 +773,7 @@ public void setVolume(float volume) {
     this.volume.pendingResultCallback =
         new ResultCallback<MediaChannelResult>() {
           @Override
-          public void onResult(@NonNull MediaChannelResult result) {
+          public void onResult(MediaChannelResult result) {
             if (remoteMediaClient != null) {
               updateVolumeAndNotifyIfChanged(this);
               listeners.flushEvents();
@@ -920,7 +919,7 @@ public void setDeviceMuted(boolean muted, @C.VolumeFlags int flags) {
     this.deviceMuted.pendingResultCallback =
         new ResultCallback<MediaChannelResult>() {
           @Override
-          public void onResult(@NonNull MediaChannelResult result) {
+          public void onResult(MediaChannelResult result) {
             if (remoteMediaClient != null) {
               updateDeviceMutedAndNotifyIfChanged(this);
               listeners.flushEvents();