Devirtualize Frame::domWindow().

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>
@@ skipping 46 matching lines @@
 
 Frame::~Frame() {
   InstanceCounters::decrementCounter(InstanceCounters::FrameCounter);
   ASSERT(!m_owner);
 }
 
 DEFINE_TRACE(Frame) {
   visitor->trace(m_treeNode);
   visitor->trace(m_host);
   visitor->trace(m_owner);
+  visitor->trace(m_domWindow);
   visitor->trace(m_client);
 }
 
 void Frame::detach(FrameDetachType type) {
   ASSERT(m_client);
   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.
@@ skipping 267 matching lines @@
 
   ASSERT(page());
 
   if (m_owner)
     m_owner->setContentFrame(*this);
   else
     page()->setMainFrame(this);
 }
 
 }  // namespace blink