Refactoring: Extract DocumentInit for capture Document construction parameter.

Source/core/html/HTMLDocument.h

Index: Source/core/html/HTMLDocument.h
diff --git a/Source/core/html/HTMLDocument.h b/Source/core/html/HTMLDocument.h
index 82f46a3566a0dd5911abb337255bc8a4b3facbaa..369758a0b024b41e72a6d1767a5345c0d0920e59 100644
--- a/Source/core/html/HTMLDocument.h
+++ b/Source/core/html/HTMLDocument.h
@@ -35,9 +35,9 @@ class HTMLElement;
 
 class HTMLDocument : public Document, public CachedResourceClient {
 public:
-    static PassRefPtr<HTMLDocument> create(Frame* frame, const KURL& url)
+    static PassRefPtr<HTMLDocument> create(const DocumentInit& initializer = DocumentInit())
     {
-        return adoptRef(new HTMLDocument(frame, url));
+        return adoptRef(new HTMLDocument(initializer));
     }
     virtual ~HTMLDocument();
 
@@ -74,7 +74,7 @@ public:
     static bool isCaseSensitiveAttribute(const QualifiedName&);
 
 protected:
-    HTMLDocument(Frame*, const KURL&, DocumentClassFlags extendedDocumentClasses = DefaultDocumentClass);
+    HTMLDocument(const DocumentInit&, DocumentClassFlags extendedDocumentClasses = DefaultDocumentClass);
 
 private:
     HTMLBodyElement* bodyAsHTMLBodyElement() const;