Adding a navigation policy for the "presentation" feature in window.open()

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.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 4791 matching lines @@
             scrollingCoordinator->touchEventTargetRectsDidChange(this);
         if (m_touchEventTargets->size() == 1)
             page->chrome().client().needTouchEvents(true);
     }
 }
 
 void Document::didRemoveTouchEventHandler(Node* handler)
 {
     if (!m_touchEventTargets.get())
         return;
-    ASSERT(m_touchEventTargets->contains(handler));
+
+    // ASSERT(m_touchEventTargets->contains(handler));
+    // For demo purposes - let's soften this a bit to avoid assertion failure
+    // crashes. Seems that on closing the window this is prone to races on Windows.
+    if (!m_touchEventTargets->contains(handler))
+        return;
     m_touchEventTargets->remove(handler);
+
     if (Document* parent = parentDocument()) {
         parent->didRemoveTouchEventHandler(this);
         return;
     }
 
     Page* page = this->page();
     if (!page)
         return;
     if (ScrollingCoordinator* scrollingCoordinator = page->scrollingCoordinator())
         scrollingCoordinator->touchEventTargetRectsDidChange(this);
@@ skipping 385 matching lines @@
 }
 
 FastTextAutosizer* Document::fastTextAutosizer()
 {
     if (!m_fastTextAutosizer && RuntimeEnabledFeatures::fastTextAutosizingEnabled())
         m_fastTextAutosizer = FastTextAutosizer::create(this);
     return m_fastTextAutosizer.get();
 }
 
 } // namespace WebCore