repl: use promise#finally

PR-URL: #23971
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

lib/repl.js

@@ -374,25 +374,19 @@ function REPLServer(prompt,
         }
 
         promise.then((result) => {
-          // Remove prioritized SIGINT listener if it was not called.
-          // TODO(TimothyGu): Use Promise.prototype.finally when it becomes
-          // available.
-          prioritizedSigintQueue.delete(sigintListener);
-
           finishExecution(undefined, result);
-          unpause();
         }, (err) => {
-          // Remove prioritized SIGINT listener if it was not called.
-          prioritizedSigintQueue.delete(sigintListener);
-
-          unpause();
           if (err && process.domain) {
             debug('not recoverable, send to domain');
             process.domain.emit('error', err);
             process.domain.exit();
             return;
           }
           finishExecution(err);
+        }).finally(() => {
+          // Remove prioritized SIGINT listener if it was not called.
+          prioritizedSigintQueue.delete(sigintListener);
+          unpause();
         });
       }
     }