Revert "examples/pcm: Bug fix: audio.Player refs should be held not to be GCed"

This reverts commit 52f0bd7e21.

examples/pcm/main.go

@@ -83,9 +83,6 @@ func square(out []int16, volume float64, freq float64, sequence float64) {
 	}
 }
 
-// players holds audio.Player objects not to be GCed.
-var players = map[*audio.Player]struct{}{}
-
 // toBytes returns the 2ch little endian 16bit byte sequence with the given left/right sequence.
 func toBytes(l, r []int16) []byte {
 	if len(l) != len(r) {
@@ -130,7 +127,6 @@ func playNote(scoreIndex int) rune {
 
 	p, _ := audio.NewPlayerFromBytes(audioContext, toBytes(l, r))
 	p.Play()
-	players[p] = struct{}{}
 
 	return rune(note)
 }
@@ -150,18 +146,6 @@ func update(screen *ebiten.Image) error {
 	}
 	frames++
 
-	// Close players that alrady finish.
-	closed := []*audio.Player{}
-	for p := range players {
-		if p.IsPlaying() {
-			continue
-		}
-		closed = append(closed, p)
-	}
-	for _, p := range closed {
-		delete(players, p)
-	}
-
 	if ebiten.IsDrawingSkipped() {
 		return nil
 	}