[Blink, RemotePlayback] Dismissing the dialog rejects with NotAllowedError.

third_party/WebKit/Source/modules/remoteplayback/RemotePlayback.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/remoteplayback/RemotePlayback.h"
 
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/HTMLNames.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/Document.h"
@@ skipping 143 matching lines @@
 
   m_availability = available;
   for (auto& availabilityObject : m_availabilityObjects)
     availabilityObject->availabilityChanged(available);
 }
 
 void RemotePlayback::promptCancelled() {
   if (!m_promptPromiseResolver)
     return;
 
-  m_promptPromiseResolver->resolve();
+  m_promptPromiseResolver->reject(
+      DOMException::create(NotAllowedError, "The prompt was dismissed."));
   m_promptPromiseResolver = nullptr;
 }
 
 DEFINE_TRACE(RemotePlayback) {
   visitor->trace(m_availabilityObjects);
   visitor->trace(m_promptPromiseResolver);
   visitor->trace(m_mediaElement);
   EventTargetWithInlineData::trace(visitor);
 }
 
 }  // namespace blink