Devirtualize PageConsole and MHTMLArchive destructors

Source/core/loader/archive/MHTMLArchive.h

 /*
  * 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 40 matching lines @@
     static PassRefPtr<MHTMLArchive> create(const KURL&, SharedBuffer*);
 
     enum EncodingPolicy {
         UseDefaultEncoding,
         UseBinaryEncoding
     };
 
     // Binary encoding results in smaller MHTML files but they might not work in other browsers.
     static PassRefPtr<SharedBuffer> generateMHTMLData(const Vector<SerializedResource>&, EncodingPolicy, const String& title, const String& mimeType);
 
-    virtual ~MHTMLArchive();
+    ~MHTMLArchive();
     ArchiveResource* mainResource() { return m_mainResource.get(); }
     const Vector<RefPtr<ArchiveResource> >& subresources() const { return m_subresources; }
     const Vector<RefPtr<MHTMLArchive> >& subframeArchives() const { return m_subframeArchives; }
 
 private:
     friend class MHTMLParser;
     MHTMLArchive();
 
     void setMainResource(PassRefPtr<ArchiveResource> mainResource) { m_mainResource = mainResource; }
     void addSubresource(PassRefPtr<ArchiveResource> subResource) { m_subresources.append(subResource); }
     void addSubframeArchive(PassRefPtr<MHTMLArchive> subframeArchive) { m_subframeArchives.append(subframeArchive); }
 
     void clearAllSubframeArchives();
     void clearAllSubframeArchivesImpl(Vector<RefPtr<MHTMLArchive> >* clearedArchives);
 
     RefPtr<ArchiveResource> m_mainResource;
     Vector<RefPtr<ArchiveResource> > m_subresources;
     Vector<RefPtr<MHTMLArchive> > m_subframeArchives;
 };
 
 }
 
 #endif