From bug 112191. There is no CustomElement class in C++ side. So having this name breaks the convention that expects the C++ class without "V8" prefix. It should have another name and should be got rid of.
Created attachment 195006 [details] Patch
Comment on attachment 195006 [details] Patch rubber stamped
Committed r146851: <http://trac.webkit.org/changeset/146851>