Remove generate_cacheable_wrapper_characterdata!
Remove generate_cacheable_wrapper!
Remove generate_cacheable_wrapper_node!
Remove generate_cacheable_wrapper_htmlmediaelement!
Remove generate_cacheable_wrapper_htmltablecellelement!
Remove generate_cacheable_wrapper_htmlelement!
Merge pull request #2724 from saneyuki/rm_macro

Removes 'dom/binding/element.rs'