Refactoring: Extract DocumentInit for capture Document construction parameter.

Source/core/html/TextDocument.h

Index: Source/core/html/TextDocument.h
diff --git a/Source/core/html/TextDocument.h b/Source/core/html/TextDocument.h
index c0d338468e8d013fe3d5418b29080a66dc47f43c..8ae93657e72278e5223aacce50423566f5d072ca 100644
--- a/Source/core/html/TextDocument.h
+++ b/Source/core/html/TextDocument.h
@@ -31,13 +31,13 @@ namespace WebCore {
 
 class TextDocument FINAL : public HTMLDocument {
 public:
-    static PassRefPtr<TextDocument> create(Frame* frame, const KURL& url)
+    static PassRefPtr<TextDocument> create(const DocumentInit& initializer = DocumentInit())
     {
-        return adoptRef(new TextDocument(frame, url));
+        return adoptRef(new TextDocument(initializer));
     }
 
 private:
-    TextDocument(Frame*, const KURL&);
+    TextDocument(const DocumentInit&);
     
     virtual PassRefPtr<DocumentParser> createParser();
 };