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The PopulatePrinterList() interface is not used anywhere, and can be
deleted.

The method to provide meaningful data back to tests which use this class
should be improved to be consistent by other changes to
TestPrintBackend, so that tests which use
PrintBackend::EnumeratePrinters() can get something meaningful.

Bug: 809738
Change-Id: I9da77434456ca9af4c75928b8465966f23cbed1c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2469230
Commit-Queue: Alan Screen <awscreen@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817166}