Revert "Drop 10.5 support: use ServiceManagement.framework directly."

Revert "Drop 10.5 support: use ServiceManagement.framework directly."

This reverts commit 63fd3ae47d2513ef4390c3d8c0dde3fa95152480.

SMJobRemove() still performs a 1-second sleep() when its |wait|
parameter is true. Radar 18398683 is filed. In the mean time, the
launchd-based implementation of these functions does not have this
undesirable property.

The comments have been revised to not reflect operating systems before
Mac OS X 10.6. Comments describing bugs in earlier 10.10 seeds that have
since been fixed have been removed.

TEST=util_test Launchd.*:ServiceManagement.*
R=rsesek@chromium.org

Committed: https://chromium.googlesource.com/crashpad/crashpad/+/75988925f9161e4c339f3a02a1d8ed3e7d5a9018

[Mark Mentovai, 2014-09-19 21:34:47]

mark@chromium.org changed reviewers:
+ rsesek@chromium.org

[Mark Mentovai, 2014-09-19 21:34:48]

SMJobRemove() is still too buggy on 10.10. I could deal with the return value
thing, but it has a 1-second blocking sleep() when asked to wait for a job to
terminate.

This should be easy to review because it’s all stuff you’ve already reviewed,
it’s just coming back from the dead.

[Robert Sesek, 2014-09-22 15:12:05]

LGTM, though I only reviewed the PS1 <> PS3 diffs

[Mark Mentovai, 2014-09-22 17:11:44]

Committed patchset #3 (id:30001) manually as 7598892 (presubmit successful).