Change Page::m_mainFrame to be a Frame.

Source/core/inspector/PageDebuggerAgent.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 139 matching lines @@
 
 PassOwnPtr<ScriptSourceCode> PageDebuggerAgent::preprocess(LocalFrame* frame, const ScriptSourceCode& sourceCode)
 {
     ASSERT(m_pageScriptDebugServer);
     ASSERT(frame);
     return m_pageScriptDebugServer->preprocess(frame, sourceCode);
 }
 
 void PageDebuggerAgent::didCommitLoad(LocalFrame* frame, DocumentLoader* loader)
 {
-    LocalFrame* mainFrame = frame->page()->mainFrame();
+    Frame* mainFrame = frame->page()->mainFrame();
     if (loader->frame() == mainFrame)
         pageDidCommitLoad();
 }
 
 } // namespace WebCore