Backed out 4 changesets (bug 497003) for intermittent OSX crashes.

Backed out changeset 43223a927976 (bug 497003)
Backed out changeset 26c1d80edf1f (bug 497003)
Backed out changeset 841ed173ba2b (bug 497003)
Backed out changeset f70770fc6dce (bug 497003)