[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 149 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