Refactoring: Extract DocumentInit for capture Document construction parameter.

Source/core/html/MediaDocument.h

 /*
  * Copyright (C) 2008,2009 Apple 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 14 matching lines @@
 
 #ifndef MediaDocument_h
 #define MediaDocument_h
 
 #include "core/html/HTMLDocument.h"
 
 namespace WebCore {
 
 class MediaDocument FINAL : public HTMLDocument {
 public:
-    static PassRefPtr<MediaDocument> create(Frame* frame, const KURL& url)
+    static PassRefPtr<MediaDocument> create(const DocumentInit& initializer = DocumentInit())
     {
-        return adoptRef(new MediaDocument(frame, url));
+        return adoptRef(new MediaDocument(initializer));
     }
 
 private:
-    MediaDocument(Frame*, const KURL&);
+    MediaDocument(const DocumentInit&);
 
     virtual PassRefPtr<DocumentParser> createParser() OVERRIDE;
 
     virtual void defaultEventHandler(Event*) OVERRIDE;
 };
 
 }
 
 #endif