Have CSSParserContext take a Document reference in argument

Source/web/WebDocument.cpp

 /*
  * Copyright (C) 2009 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 185 matching lines @@
 }
 
 WebDocumentType WebDocument::doctype() const
 {
     return WebDocumentType(constUnwrap<Document>()->doctype());
 }
 
 void WebDocument::insertUserStyleSheet(const WebString& sourceCode, UserStyleLevel styleLevel)
 {
     RefPtr<Document> document = unwrap<Document>();
-
-    RefPtr<StyleSheetContents> parsedSheet = StyleSheetContents::create(document.get());
+    ASSERT(document);
+    RefPtr<StyleSheetContents> parsedSheet = StyleSheetContents::create(*document.get());
     parsedSheet->setIsUserStyleSheet(styleLevel == UserStyleUserLevel);
     parsedSheet->parseString(sourceCode);
     if (parsedSheet->isUserStyleSheet())
         document->styleSheetCollections()->addUserSheet(parsedSheet);
     else
         document->styleSheetCollections()->addAuthorSheet(parsedSheet);
 }
 
 void WebDocument::cancelFullScreen()
 {
@@ skipping 84 matching lines @@
     m_private = elem;
     return *this;
 }
 
 WebDocument::operator PassRefPtr<Document>() const
 {
     return toDocument(m_private.get());
 }
 
 } // namespace WebKit