fix(AirPlay): Prefer Playback Remote API for closeOpenSessions (#7500)

Author: avelad

lib/media/drm_engine.js

@@ -515,7 +515,14 @@ shaka.media.DrmEngine = class {
     this.video_ = video;
 
     this.eventManager_.listenOnce(this.video_, 'play', () => this.onPlay_());
-    if ('webkitCurrentPlaybackTargetIsWireless' in this.video_) {
+    if (this.video_.remote) {
+      this.eventManager_.listen(this.video_.remote, 'connect',
+          () => this.closeOpenSessions_());
+      this.eventManager_.listen(this.video_.remote, 'connecting',
+          () => this.closeOpenSessions_());
+      this.eventManager_.listen(this.video_.remote, 'disconnect',
+          () => this.closeOpenSessions_());
+    } else if ('webkitCurrentPlaybackTargetIsWireless' in this.video_) {
       this.eventManager_.listen(this.video_,
           'webkitcurrentplaybacktargetiswirelesschanged',
           () => this.closeOpenSessions_());