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Instantiating a PrintBackend class is done through a CreateInstance()
call.  This call has included a parameter to optionally seed the new
instance with some initial values different from the defaults.  This
parameter is never made use of in the existing code.

Cleanup of this parameter will ease the effort to mojoify the
PrintBackend class.

Bug: 809738
Change-Id: I460e3edd14c2fd830d9d8f126b84619ec9e53597
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2354541Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
Commit-Queue: Alan Screen <awscreen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798201}