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Change it to GetSettingsOnBlockingTaskRunner(), to better reflect the
fact that the blocking pool no longer exists. Also rename
GetPrinterCapabilitiesOnBlockingPoolThread() for the same reason.

Change-Id: I4014eecc30611e94f31429477de56c54f90b3377
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1900769Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713245}