[BlackBerry] User credentials is not correctly handled
https://bugs.webkit.org/show_bug.cgi?id=110994

Patch by Alberto Garcia <agarcia@igalia.com> on 2013-02-28
Reviewed by Yong Li.

WTF::String::utf8 no longer receives a bool, see r134173.

* platform/network/blackberry/CredentialBackingStore.cpp:
(WebCore::CredentialBackingStore::encryptedString):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@144316 268f45cc-cd09-0410-ab3c-d52691b4dbfc