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This is a reland of 66630f37.

Reverted in 1764333 for breaking linux-chromeos-rel.
This change incorporates the fix.

Original change's description:
> Removing dead ServiceManager constants
>
> Since ServiceManager went away, we're clearing up some leftover
> CupsProxyService constants. Trivial change.
>
> Bug: chromium:945409
> Test: confirmed service behavior unchanged
> Change-Id: I45ffdeb3b0ad1990798a4a4d5115e791a6eefbfe
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1764430
> Auto-Submit: Luum Habtemariam <luum@chromium.org>
> Reviewed-by: Ken Rockot <rockot@google.com>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Commit-Queue: Daniel Cheng <dcheng@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#689164}

Bug: chromium:945409, chromium:996442
Change-Id: Ie2d2a835787d5d3c178ee632f00031f30746d1ce
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1764525Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Sean Kau <skau@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Luum Habtemariam <luum@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690400}