Make AttachBehavior a required argument.

Source/core/page/DragController.cpp

 /*
  * Copyright (C) 2007, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Google Inc.
  *
  * 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
@@ skipping 151 matching lines @@
                 RefPtr<HTMLAnchorElement> anchor = HTMLAnchorElement::create(document);
                 anchor->setHref(url);
                 if (title.isEmpty()) {
                     // Try the plain text first because the url might be normalized or escaped.
                     if (dragData->containsPlainText())
                         title = dragData->asPlainText(frame);
                     if (title.isEmpty())
                         title = url;
                 }
                 RefPtr<Node> anchorText = document->createTextNode(title);
-                anchor->appendChild(anchorText, IGNORE_EXCEPTION);
+                anchor->appendChild(anchorText, IGNORE_EXCEPTION, DeprecatedAttachNow);
                 RefPtr<DocumentFragment> fragment = document->createDocumentFragment();
-                fragment->appendChild(anchor, IGNORE_EXCEPTION);
+                fragment->appendChild(anchor, IGNORE_EXCEPTION, DeprecatedAttachNow);
                 return fragment.get();
             }
         }
     }
     if (allowPlainText && dragData->containsPlainText()) {
         chosePlainText = true;
         return createFragmentFromText(context.get(), dragData->asPlainText(frame)).get();
     }
 
     return 0;
@@ skipping 745 matching lines @@
     return false;
 #endif
 }
 
 void DragController::cleanupAfterSystemDrag()
 {
 }
 
 } // namespace WebCore