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CL https://chromium-review.googlesource.com/c/chromium/src/+/1013118 added
a HoldRefCallback function to print_job_worker.cc which conflicts with
an identically named function in print_job.cc in jumbo builds.  Let's
rename this one.

Change-Id: I41d6c064c968bd72c736d648439a372cc4ca64a1
Reviewed-on: https://chromium-review.googlesource.com/1013495Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Mostyn Bramley-Moore <mostynb@vewd.com>
Cr-Commit-Position: refs/heads/master@{#551407}