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- "Print Compositor" is always on when printing is on.
- "Printing Service" is for either Print Preview (PWG conversion), or
  printing on Windows (EMF/PS/Text conversion).
- EMF bits are Windows-only.

Additionally:
- Fix the name of "Printing Service" to be consistent with other names.
- Remove an unused GRD entry for the "PDF Convertor" which was the
  precursor to the "Printing Service".

Change-Id: I69744f91b8113a8104438271c7c58fff8161cde7
Reviewed-on: https://chromium-review.googlesource.com/1054639
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Jay Civelli <jcivelli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558541}