Dispatch slotchange events in "notify mutation observers" steps

third_party/WebKit/Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
@@ skipping 2432 matching lines @@
   // ExecutionContext.
   if (m_domWindow)
     m_domWindow->clearEventQueue();
 
   if (m_layoutView)
     m_layoutView->setIsInWindow(false);
 
   if (registrationContext())
     registrationContext()->documentWasDetached();
 
+  MutationObserver::cleanSlotChangeList(*this);
+
   m_hoverNode = nullptr;
   m_activeHoverElement = nullptr;
   m_autofocusElement = nullptr;
 
   if (m_focusedElement.get()) {
     Element* oldFocusedElement = m_focusedElement;
     m_focusedElement = nullptr;
     if (frameHost())
       frameHost()->chromeClient().focusedNodeChanged(oldFocusedElement,
                                                      nullptr);
@@ skipping 4052 matching lines @@
 }
 
 void showLiveDocumentInstances() {
   WeakDocumentSet& set = liveDocumentSet();
   fprintf(stderr, "There are %u documents currently alive:\n", set.size());
   for (Document* document : set)
     fprintf(stderr, "- Document %p URL: %s\n", document,
             document->url().getString().utf8().data());
 }
 #endif