Make AttachBehavior a required argument.

Source/core/page/DragController.cpp

Index: Source/core/page/DragController.cpp
diff --git a/Source/core/page/DragController.cpp b/Source/core/page/DragController.cpp
index b2c61293e7da0d1257d7548059a0cd58646240ad..ac6d21bb9031994bd1d253fb101a89a3ad54be97 100644
--- a/Source/core/page/DragController.cpp
+++ b/Source/core/page/DragController.cpp
@@ -169,9 +169,9 @@ static PassRefPtr<DocumentFragment> documentFragmentFromDragData(DragData* dragD
                         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();
             }
         }