Detach old frame on WebFrame::swap.

Source/core/html/HTMLFrameOwnerElement.cpp

 /*
  * Copyright (C) 2006, 2007, 2009 Apple Inc. All rights reserved.
  *
  * 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 131 matching lines @@
         node->decrementConnectedSubframeCount();
 }
 
 void HTMLFrameOwnerElement::disconnectContentFrame()
 {
     // FIXME: Currently we don't do this in removedFrom because this causes an
     // unload event in the subframe which could execute script that could then
     // reach up into this document and then attempt to look back down. We should
     // see if this behavior is really needed as Gecko does not allow this.
     if (RefPtrWillBeRawPtr<Frame> frame = contentFrame()) {
-        frame->detach();
+        frame->detach(FrameDetachType::Remove);
     }
 #if ENABLE(OILPAN)
     // Oilpan: a plugin container must be explicitly disposed before it
     // is swept and finalized. This is because the underlying plugin needs
     // to be able to access a fully-functioning frame (and all it refers
     // to) while it destructs and cleans out its resources.
     if (m_widget) {
         m_widget->dispose();
         m_widget = nullptr;
     }
@@ skipping 100 matching lines @@
 DEFINE_TRACE(HTMLFrameOwnerElement)
 {
     visitor->trace(m_contentFrame);
     visitor->trace(m_widget);
     HTMLElement::trace(visitor);
     FrameOwner::trace(visitor);
 }
 
 
 } // namespace blink