Correct post-commit comment in mutex timedlock test.
Correct post-commit comment in mutex timedlock test.

Follow-up to: https://codereview.chromium.org/22377004/

R=mseaborn@chromium.org

Review URL: https://codereview.chromium.org/23195003

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@12005 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client