Remove "import JobService" to remove build time dependency

This is needed to move the jobscheduler classes to its own jar for
mainline.

Bug: 137763703
Test: Doc change only, presubmit
Merged-in: I117ffc23362a61923a9f93c1532ab582e2421402
(cherry-pick from I117ffc23362a61923a9f93c1532ab582e2421402)

Change-Id: I1b3fba3e90f4b3c943f44b63eeb776f5da973591