fix: Silence uncaught rejection errors when closing EME sessions (#7881)

Fixes #4199

Author: avelad

lib/drm/drm_engine.js

@@ -1757,7 +1757,7 @@ shaka.drm.DrmEngine = class {
       if (found && !found.updatePromise) {
         shaka.log.debug('Session has expired', session.sessionId);
         this.activeSessions_.delete(session);
-        session.close().catch(() => {});  // Silence uncaught rejection errors
+        this.closeSession_(session);
       }
     }
 
@@ -2116,7 +2116,7 @@ shaka.drm.DrmEngine = class {
     try {
       await shaka.util.Functional.promiseWithTimeout(
           shaka.drm.DrmEngine.CLOSE_TIMEOUT_,
-          Promise.all([session.close(), session.closed]));
+          Promise.all([session.close().catch(() => {}), session.closed]));
     } catch (e) {
       shaka.log.warning('Timeout waiting for session close');
     }