Use pthread_kill on solaris.
Use pthread_kill on solaris.

Landing patch by Ryan Dahl.

TBR=vegorov@chromium.org

Original review: http://codereview.chromium.org/6667030/

Review URL: http://codereview.chromium.org/6667031

git-svn-id: b158db1e4b4ab85d4c9e510fdef4b1e8c614b15b@7142 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh