Make ApplicationCache a DOMWindowClient

third_party/WebKit/Source/core/loader/appcache/ApplicationCacheHost.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 242 matching lines @@
 }
 
 void ApplicationCacheHost::dispatchDOMEvent(
     EventID id,
     int progressTotal,
     int progressDone,
     WebApplicationCacheHost::ErrorReason errorReason,
     const String& errorURL,
     int errorStatus,
     const String& errorMessage) {
-  if (!m_domApplicationCache)
+  // Don't dispatch an event if the window is detached.
+  if (!m_domApplicationCache || !m_domApplicationCache->domWindow())
     return;
 
   const AtomicString& eventType = ApplicationCache::toEventType(id);
-  if (eventType.isEmpty() || !m_domApplicationCache->getExecutionContext())
+  if (eventType.isEmpty())
     return;
   Event* event = nullptr;
   if (id == kProgressEvent) {
     event = ProgressEvent::create(eventType, true, progressDone, progressTotal);
   } else if (id == kErrorEvent) {
     event = ApplicationCacheErrorEvent::create(errorReason, errorURL,
                                                errorStatus, errorMessage);
   } else {
     event = Event::create(eventType);
   }
@@ skipping 58 matching lines @@
   notifyApplicationCache(kErrorEvent, 0, 0, reason, url.string(), status,
                          message);
 }
 
 DEFINE_TRACE(ApplicationCacheHost) {
   visitor->trace(m_domApplicationCache);
   visitor->trace(m_documentLoader);
 }
 
 }  // namespace blink