BackgroundFetchRegistration.abort() should return a Promise.

third_party/WebKit/Source/modules/background_fetch/BackgroundFetchedEvent.cpp

 // Copyright 2017 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/background_fetch/BackgroundFetchedEvent.h"
 
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "core/dom/DOMException.h"
 #include "modules/EventModulesNames.h"
@@ skipping 38 matching lines @@
 }
 
 void BackgroundFetchedEvent::didUpdateUI(
     ScriptPromiseResolver* resolver,
     mojom::blink::BackgroundFetchError error) {
   switch (error) {
     case mojom::blink::BackgroundFetchError::NONE:
       resolver->resolve();
       return;
     case mojom::blink::BackgroundFetchError::DUPLICATED_TAG:
+    case mojom::blink::BackgroundFetchError::INVALID_TAG:
       // Not applicable for this callback.
       break;
   }
 
   NOTREACHED();
 }
 
 const AtomicString& BackgroundFetchedEvent::interfaceName() const {
   return EventNames::BackgroundFetchedEvent;
 }
 
 DEFINE_TRACE(BackgroundFetchedEvent) {
   visitor->trace(m_fetches);
   visitor->trace(m_registration);
   BackgroundFetchEvent::trace(visitor);
 }
 
 }  // namespace blink