Use ElementTraversal in SelectorDataList::execute
https://bugs.webkit.org/show_bug.cgi?id=116131

Reviewed by Darin Adler.

Use ElementTraversal::firstWithin and ElementTraversal::next to simplify the code.

* dom/SelectorQuery.cpp:
(WebCore::SelectorDataList::execute):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@150099 268f45cc-cd09-0410-ab3c-d52691b4dbfc