Disable regex checking of URLs in SafeUriHostedModeUtils; this regex appears to
cause stack overflows in some cases.

Review at http://gwt-code-reviews.appspot.com/1443813


git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@10285 8db76d5a-ed1c-0410-87a9-c151d255dfc7