Convert HTMLFrameOwnerElement and FocusController to use Frame.

Source/core/page/PageSerializer.cpp

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 136 matching lines @@
 
     // FIXME: For object (plugins) tags and video tag we could replace them by an image of their current contents.
 }
 
 void SerializerMarkupAccumulator::appendCustomAttributes(StringBuilder& out, const Element& element, Namespaces* namespaces)
 {
     if (!element.isFrameOwnerElement())
         return;
 
     const HTMLFrameOwnerElement& frameOwner = toHTMLFrameOwnerElement(element);
-    LocalFrame* frame = frameOwner.contentFrame();
+    LocalFrame* frame = toLocalFrame(frameOwner.contentFrame());
     if (!frame)
         return;
 
     KURL url = frame->document()->url();
     if (url.isValid() && !url.isBlankURL())
         return;
 
     // We need to give a fake location to blank frames so they can be referenced by the serialized frame.
     url = m_serializer->urlForBlankFrame(frame);
     appendAttribute(out, element, Attribute(frameOwnerURLAttributeName(frameOwner), AtomicString(url.string())), namespaces);
@@ skipping 212 matching lines @@
     if (iter != m_blankFrameURLs.end())
         return iter->value;
     String url = "wyciwyg://frame/" + String::number(m_blankFrameCounter++);
     KURL fakeURL(ParsedURLString, url);
     m_blankFrameURLs.add(frame, fakeURL);
 
     return fakeURL;
 }
 
 }