Remove URLCore top-level directory.  The diff wasn't clear where this folder was going and Darin Adler would prefer that we not put this code in a top-level directory.
Remove URLCore top-level directory.  The diff wasn't clear where this folder was going and Darin Adler would prefer that we not put this code in a top-level directory.

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@58683 bbb929c8-8fbe-4397-9dbb-9b2b20218538
axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk,axinging/chromium-crosswalk