Don't copy Vector<UChar> when passing to new String methods from bug 109617
https://bugs.webkit.org/show_bug.cgi?id=109708

Reviewed by Tony Gentilcore.

Thanks for the catch Darin.

* wtf/text/AtomicString.h:
(WTF::AtomicString::AtomicString):
* wtf/text/StringImpl.h:
(WTF::StringImpl::create8BitIfPossible):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@142766 268f45cc-cd09-0410-ab3c-d52691b4dbfc