Signal no pending activity in destructed contexts.

third_party/WebKit/Source/core/css/MediaQueryList.cpp

 /*
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Library General Public
  *  License as published by the Free Software Foundation; either
  *  version 2 of the License, or (at your option) any later version.
  *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 65 matching lines @@
 }
 
 void MediaQueryList::removeListener(MediaQueryListListener* listener) {
   if (!listener)
     return;
 
   m_listeners.remove(listener);
 }
 
 bool MediaQueryList::hasPendingActivity() const {
-  return m_listeners.size() || hasEventListeners(EventTypeNames::change);
+  return getExecutionContext() &&
+         (m_listeners.size() || hasEventListeners(EventTypeNames::change));
 }
 
 void MediaQueryList::contextDestroyed() {
   m_listeners.clear();
   removeAllEventListeners();
 }
 
 bool MediaQueryList::mediaFeaturesChanged(
     HeapVector<Member<MediaQueryListListener>>* listenersToNotify) {
   m_matchesDirty = true;
@@ skipping 29 matching lines @@
 
 const AtomicString& MediaQueryList::interfaceName() const {
   return EventTargetNames::MediaQueryList;
 }
 
 ExecutionContext* MediaQueryList::getExecutionContext() const {
   return SuspendableObject::getExecutionContext();
 }
 
 }  // namespace blink