Refactoring: Extract DocumentInit for capture Document construction parameter.

Source/core/html/HTMLImportsController.cpp

 /*
  * Copyright (C) 2013 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 161 matching lines @@
     if (HTMLImportsController* controller = this->controller())
         controller->didLoad(this);
 }
 
 HTMLImportLoader::State HTMLImportLoader::startParsing(const ResourceResponse& response)
 {
     // Current canAccess() implementation isn't sufficient for catching cross-domain redirects: http://crbug.com/256976
     if (!controller()->cachedResourceLoader()->canAccess(m_resource.get()))
         return StateError;
 
-    m_importedDocument = HTMLDocument::create(0, response.url());
-    m_importedDocument->setImport(this);
+    m_importedDocument = HTMLDocument::create(DocumentInit(response.url(), 0, this));
     m_writer = DocumentWriter::create(m_importedDocument.get(), response.mimeType(), response.textEncodingName());
 
     return StateLoading;
 }
 
 HTMLImportLoader::State HTMLImportLoader::finish()
 {
     if (!m_parent)
         return StateError;
     // The writer instance indicates that a part of the document can be already loaded.
@@ skipping 129 matching lines @@
 {
     return m_master;
 }
 
 void HTMLImportsController::wasDetachedFromDocument()
 {
     clear();
 }
 
 } // namespace WebCore