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This change drops uses of GTMSMJobRemove and GTMSMJobSubmit, and replaces themm
with uses of new functions in the mac::services namespace.

Bug: 903800
Change-Id: I0e38ddf3532274bd8ff0ea861f14707a183cd3ff
Reviewed-on: https://chromium-review.googlesource.com/c/1337823Reviewed-by: Mark Mentovai <mark@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610864}