Unreviewed. Fix syntax error in runtests.py.

* Scripts/webkitpy/tool/steps/runtests.py:
(RunTests.run):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@142182 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Fix an incorrect comment from r142163

Unreviewed.

Patch by Benjamin Poulain <bpoulain@apple.com> on 2013-02-07

* wtf/MainThread.h:
I accidentally copied PLATFORM(IOS) instead of USE(WEB_THREAD) for the #ifdef closing.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@142183 268f45cc-cd09-0410-ab3c-d52691b4dbfc