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diff --git a/Source/WebCore/html/HTMLFrameElementBase.h b/Source/WebCore/html/HTMLFrameElementBase.h
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+/*
+ * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
+ *           (C) 1999 Antti Koivisto (koivisto@kde.org)
+ *           (C) 2000 Simon Hausmann <hausmann@kde.org>
+ * Copyright (C) 2004, 2006, 2008, 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
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef HTMLFrameElementBase_h
+#define HTMLFrameElementBase_h
+
+#include "HTMLFrameOwnerElement.h"
+#include "ScrollTypes.h"
+
+namespace WebCore {
+
+class HTMLFrameElementBase : public HTMLFrameOwnerElement {
+public:
+    KURL location() const;
+    void setLocation(const String&);
+
+    virtual ScrollbarMode scrollingMode() const { return m_scrolling; }
+    
+    int marginWidth() const { return m_marginWidth; }
+    int marginHeight() const { return m_marginHeight; }
+
+    int width() const;
+    int height() const;
+
+    void setRemainsAliveOnRemovalFromTree(bool);
+
+protected:
+    HTMLFrameElementBase(const QualifiedName&, Document*);
+
+    bool isURLAllowed() const;
+
+    virtual void parseMappedAttribute(Attribute*);
+    virtual void insertedIntoDocument();
+    virtual void attach();
+
+private:
+    virtual bool supportsFocus() const;
+    virtual void setFocus(bool);
+    
+    virtual bool isURLAttribute(Attribute*) const;
+
+    virtual void willRemove();
+    void checkInDocumentTimerFired(Timer<HTMLFrameElementBase>*);
+    void updateOnReparenting();
+
+    bool viewSourceMode() const { return m_viewSource; }
+
+    void setNameAndOpenURL();
+    void openURL(bool lockHistory = true, bool lockBackForwardList = true);
+
+    AtomicString m_URL;
+    AtomicString m_frameName;
+
+    ScrollbarMode m_scrolling;
+
+    int m_marginWidth;
+    int m_marginHeight;
+
+    // This is a performance optimization some call "magic iframe" which avoids
+    // tearing down the frame hierarchy when a web page calls adoptNode on a
+    // frame owning element but does not immediately insert it into the new
+    // document before JavaScript yields to WebCore.  If the element is not yet
+    // in a document by the time this timer fires, the frame hierarchy teardown
+    // will continue.  This can also be seen as implementation of:
+    // "Removing an iframe from a Document does not cause its browsing context
+    // to be discarded. Indeed, an iframe's browsing context can survive its
+    // original parent Document if its iframe is moved to another Document."
+    // From HTML5: http://www.whatwg.org/specs/web-apps/current-work/multipage/the-iframe-element.html#the-iframe-element
+    Timer<HTMLFrameElementBase> m_checkInDocumentTimer;
+
+    bool m_viewSource;
+    bool m_remainsAliveOnRemovalFromTree;
+};
+
+} // namespace WebCore
+
+#endif // HTMLFrameElementBase_h