Use NSSRWLock instead of PRRWLock in sslSessionID. This avoids the bugs
in the lock rank checking code in PRRWLock.

Remove the suppression for the memory leak in _PR_SET_THREAD_RWLOCK_RANK.

R=agl@chromium.org,thestig@chromium.org
BUG=124445,331625
TEST=none

Review URL: https://codereview.chromium.org/129413003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243875 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 243875