Convert HTMLFrameOwnerElement and FocusController to use Frame.

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 61 matching lines @@
     : m_host(host)
     , m_ownerElement(ownerElement)
     , m_frameID(generateFrameID())
     , m_remotePlatformLayer(0)
 {
     ASSERT(page());
 
 #ifndef NDEBUG
     frameCounter.increment();
 #endif
+
+    if (this->ownerElement()) {
+        page()->incrementSubframeCount();
+        this->ownerElement()->setContentFrame(*this);
+    }
 }
 
 Frame::~Frame()
 {
+    disconnectOwnerElement();
     setDOMWindow(nullptr);
 
     // FIXME: We should not be doing all this work inside the destructor
 
 #ifndef NDEBUG
     frameCounter.decrement();
 #endif
 
     HashSet<FrameDestructionObserver*>::iterator stop = m_destructionObservers.end();
     for (HashSet<FrameDestructionObserver*>::iterator it = m_destructionObservers.begin(); it != stop; ++it)
@@ skipping 76 matching lines @@
 {
     m_host = 0;
 }
 
 bool Frame::isMainFrame() const
 {
     Page* page = this->page();
     return page && this == page->mainFrame();
 }
 
+void Frame::disconnectOwnerElement()
+{
+    if (ownerElement()) {
+        if (Document* doc = document())
+            doc->topDocument().clearAXObjectCache();

[dcheng, 2014/03/17 18:17:44]

Do we need a FIXME here? What will topDocument() do in the presence of remote
frames?

[kenrb, 2014/03/18 20:01:19]

Done.

+        ownerElement()->clearContentFrame();
+        if (page())
+            page()->decrementSubframeCount();
+    }
+    m_ownerElement = 0;
+}
+
 } // namespace WebCore