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PrintJobWorkerOwner has very little implementation that is actually
shared between PrintJob and PrinterQuery (task_runner_). Moreover,
in all cases where PrintJobWorker refers to its owner, only one of the
two subclasses is actually acceptable. Make this more clear by removing
this class.

Bug: None
Change-Id: Icaf5ff15ee5856dcade54fc4b64bb92539dc7a6f
Reviewed-on: https://chromium-review.googlesource.com/1013118Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#551345}