media: Cancel MediaCryptoReadyCB during player destruction.

media/base/android/media_codec_player.cc

Index: media/base/android/media_codec_player.cc
diff --git a/media/base/android/media_codec_player.cc b/media/base/android/media_codec_player.cc
index 565c7452c3a5d392796552680f33d7cd82108c6d..3b316f5dec12aea3862ba06ec7f571fc6fa03b8c 100644
--- a/media/base/android/media_codec_player.cc
+++ b/media/base/android/media_codec_player.cc
@@ -102,6 +102,10 @@ MediaCodecPlayer::~MediaCodecPlayer()
     audio_decoder_->ReleaseDecoderResources();
 
   if (cdm_) {
+    // Cancel previously registered callback (if any).
+    static_cast<MediaDrmBridge*>(cdm_.get())
+        ->SetMediaCryptoReadyCB(MediaDrmBridge::MediaCryptoReadyCB());
+
     DCHECK(cdm_registration_id_);
     static_cast<MediaDrmBridge*>(cdm_.get())
         ->UnregisterPlayer(cdm_registration_id_);