Use ChildFrameDisconnector when detaching child frames of a LocalFrame.

third_party/WebKit/Source/core/frame/Frame.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Simon Hausmann <hausmann@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  *                     2001 George Staikos <staikos@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2005 Alexey Proskuryakov <ap@nypop.com>
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 60 matching lines @@
     m_client->setOpener(0);
     domWindow()->resetLocation();
     disconnectOwnerElement();
     // After this, we must no longer talk to the client since this clears
     // its owning reference back to our owning LocalFrame.
     m_client->detached(type);
     m_client = nullptr;
     m_host = nullptr;
 }
 
-void Frame::detachChildren()
-{
-    typedef HeapVector<Member<Frame>> FrameVector;
-    FrameVector childrenToDetach;
-    childrenToDetach.reserveCapacity(tree().childCount());
-    for (Frame* child = tree().firstChild(); child; child = child->tree().nextSibling())
-        childrenToDetach.append(child);
-    for (const auto& child : childrenToDetach)
-        child->detach(FrameDetachType::Remove);
-}
-
 void Frame::disconnectOwnerElement()
 {
     if (m_owner) {
         m_owner->clearContentFrame();
         m_owner = nullptr;
     }
 }
 
 Page* Frame::page() const
 {
@@ skipping 215 matching lines @@
 
     ASSERT(page());
 
     if (m_owner)
         m_owner->setContentFrame(*this);
     else
         page()->setMainFrame(this);
 }
 
 } // namespace blink