Fix broken build. Replaced a static const with a #define.
https://bugs.webkit.org/show_bug.cgi?id=114577.

Unreviewed.

* runtime/Watchdog.cpp:
(JSC::Watchdog::Watchdog):
(JSC::Watchdog::isEnabled):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148641 268f45cc-cd09-0410-ab3c-d52691b4dbfc