Change Page::m_mainFrame to be a Frame.

Source/core/page/ScopedPageLoadDeferrer.cpp

 /*
  * Copyright (C) 2006, 2007, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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,
@@ skipping 23 matching lines @@
 ScopedPageLoadDeferrer::ScopedPageLoadDeferrer(Page* exclusion)
 {
     const HashSet<Page*>& pages = Page::ordinaryPages();
 
     HashSet<Page*>::const_iterator end = pages.end();
     for (HashSet<Page*>::const_iterator it = pages.begin(); it != end; ++it) {
         Page* page = *it;
         if (page == exclusion || page->defersLoading())
             continue;
 
-        m_deferredFrames.append(page->mainFrame());
+        if (page->mainFrame()->isLocalFrame()) {
+            m_deferredFrames.append(toLocalFrame(page->mainFrame()));
 
-        // Ensure that we notify the client if the initial empty document is accessed before
-        // showing anything modal, to prevent spoofs while the modal window or sheet is visible.
-        page->mainFrame()->loader().notifyIfInitialDocumentAccessed();
+            // Ensure that we notify the client if the initial empty document is accessed before
+            // showing anything modal, to prevent spoofs while the modal window or sheet is visible.
+            toLocalFrame(page->mainFrame())->loader().notifyIfInitialDocumentAccessed();
+        }
 
         // This code is not logically part of load deferring, but we do not want JS code executed
         // beneath modal windows or sheets, which is exactly when ScopedPageLoadDeferrer is used.
         for (Frame* frame = page->mainFrame(); frame; frame = frame->tree().traverseNext()) {
             if (frame->isLocalFrame())
                 toLocalFrame(frame)->document()->suspendScheduledTasks();
         }
     }
 
     size_t count = m_deferredFrames.size();
@@ skipping 11 matching lines @@
 
             for (Frame* frame = page->mainFrame(); frame; frame = frame->tree().traverseNext()) {
                 if (frame->isLocalFrame())
                     toLocalFrame(frame)->document()->resumeScheduledTasks();
             }
         }
     }
 }
 
 } // namespace WebCore