Store/disconnect media extension message listener

ext/src/shim/cast/media/classes/Media.ts

@@ -40,38 +40,7 @@ export default class Media {
     #sendMediaMessageCallbacks = new Map<string, Callbacks>();
     #lastCurrentTime?: number;
 
-    public activeTrackIds: (number[] | null) = null;
+    #listener = onMessage(message => {
-    public currentItemId: (number | null) = null;
-    public customData: any = null;
-    public currentTime: number = 0;
-    public idleReason: (string | null) = null;
-    public items: (QueueItem[] | null) = null;
-    public loadingItemId: (number | null) = null;
-    public media: (MediaInfo | null) = null;
-    public playbackRate: number = 1;
-    public playerState: string = PlayerState.IDLE;
-    public preloadedItemId: (number | null) = null;
-    public repeatMode: string = RepeatMode.OFF;
-    public supportedMediaCommands: string[] = [];
-    public volume: Volume = new Volume();
-
-
-    constructor (
-            public sessionId: string
-          , public mediaSessionId: number
-          , _internalSessionId: string) {
-
-        sendMessageResponse({
-            subject: "bridge:/media/initialize"
-          , data: {
-                sessionId
-              , mediaSessionId
-              , _internalSessionId
-            }
-          , _id: this.#id
-        });
-
-        onMessage(message => {
         if ((message as any)._id !== this.#id) {
             return;
         }
@@ -125,6 +94,37 @@ export default class Media {
 
         }
     });
+
+    public activeTrackIds: (number[] | null) = null;
+    public currentItemId: (number | null) = null;
+    public customData: any = null;
+    public currentTime: number = 0;
+    public idleReason: (string | null) = null;
+    public items: (QueueItem[] | null) = null;
+    public loadingItemId: (number | null) = null;
+    public media: (MediaInfo | null) = null;
+    public playbackRate: number = 1;
+    public playerState: string = PlayerState.IDLE;
+    public preloadedItemId: (number | null) = null;
+    public repeatMode: string = RepeatMode.OFF;
+    public supportedMediaCommands: string[] = [];
+    public volume: Volume = new Volume();
+
+
+    constructor (
+            public sessionId: string
+          , public mediaSessionId: number
+          , _internalSessionId: string) {
+
+        sendMessageResponse({
+            subject: "bridge:/media/initialize"
+          , data: {
+                sessionId
+              , mediaSessionId
+              , _internalSessionId
+            }
+          , _id: this.#id
+        });
     }
 
     public addUpdateListener (listener: UpdateListener): void {
@@ -279,6 +279,8 @@ export default class Media {
                 { type: "STOP" }
               , () => {
                     this.#isActive = false;
+                    this.#listener.disconnect();
+
                     if (successCallback) {
                         successCallback();
                     }