Name correctly the argument of StringImpl::setIsAtomic()
https://bugs.webkit.org/show_bug.cgi?id=113000

Patch by Benjamin Poulain <bpoulain@apple.com> on 2013-03-22
Reviewed by Geoffrey Garen.

* wtf/text/StringImpl.h:
(WTF::StringImpl::setIsAtomic):
The argument was probably an unfortunate copy-paste from setIsIdentifier().
Fix the name.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@146668 268f45cc-cd09-0410-ab3c-d52691b4dbfc