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TestPrintBackend was reworked to include a more consistent behavior
across its interfaces.  With this in place we can now update the testing
for print backend service to use AddValidPrinter() that ensures valid
printer definitions.

This allows the GetDefaultPrinterName test to be re-enabled and prepares
for further updates related to printer capabilities.

Bug: 809738
Change-Id: Iedf2d219da40cb508b6778f70889e86cccfb0052
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2538365Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Alan Screen <awscreen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833800}