Change FrameTree to return Frames instead of LocalFrames.

Source/core/loader/DocumentLoader.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  * 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:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 613 matching lines @@
     if (!m_archiveResourceCollection)
         m_archiveResourceCollection = adoptPtr(new ArchiveResourceCollection);
     m_archiveResourceCollection->addAllResources(archive);
 }
 
 void DocumentLoader::prepareSubframeArchiveLoadIfNeeded()
 {
     if (!m_frame->tree().parent() || !m_frame->tree().parent()->isLocalFrame())
         return;
 
-    ArchiveResourceCollection* parentCollection = m_frame->tree().parent()->loader().documentLoader()->m_archiveResourceCollection.get();
+    ArchiveResourceCollection* parentCollection = toLocalFrame(m_frame->tree().parent())->loader().documentLoader()->m_archiveResourceCollection.get();
     if (!parentCollection)
         return;
 
     m_archive = parentCollection->popSubframeArchive(m_frame->tree().uniqueName(), m_request.url());
 
     if (!m_archive)
         return;
     addAllArchiveResources(m_archive.get());
 
     ArchiveResource* mainResource = m_archive->mainResource();
@@ skipping 183 matching lines @@
 void DocumentLoader::replaceDocument(const String& source, Document* ownerDocument)
 {
     m_frame->loader().stopAllLoaders();
     m_writer = createWriterFor(m_frame, ownerDocument, m_frame->document()->url(), mimeType(), m_writer ? m_writer->encoding() : emptyAtom,  m_writer ? m_writer->encodingWasChosenByUser() : false, true);
     if (!source.isNull())
         m_writer->appendReplacingData(source);
     endWriting(m_writer.get());
 }
 
 } // namespace WebCore