Change Page::m_mainFrame to be a 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 163 matching lines @@
 }
 
 PageSerializer::PageSerializer(Vector<SerializedResource>* resources)
     : m_resources(resources)
     , m_blankFrameCounter(0)
 {
 }
 
 void PageSerializer::serialize(Page* page)
 {
-    serializeFrame(page->mainFrame());
+    serializeFrame(page->deprecatedLocalMainFrame());
 }
 
 void PageSerializer::serializeFrame(LocalFrame* frame)
 {
     ASSERT(frame->document());
     Document& document = *frame->document();
     KURL url = document.url();
     // FIXME: This probably wants isAboutBlankURL? to exclude other about: urls (like about:srcdoc)?
     if (!url.isValid() || url.protocolIsAbout()) {
         // For blank frames we generate a fake URL so they can be referenced by their containing frame.
@@ skipping 189 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;
 }
 
 }