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This CL converts PrintHostMsg_UpdatePrintSettings message to
UpdatePrintSettings() in mojom::PrintManagerHost.

It introduces several helper functions to access PrinterQuery which
runs on IO thread like GetDefaultPrintSettings().
UpdatePrintSettings() is called on UI thread and posted to IO
thread for PrintViewManagerBase to update the settings.

It removes NupPrintingTestDelegate and
PrintingMessageFilter::TestDelegate. Instead, it adds
TestPrintViewManager to override UpdatePrintSettings() for N-up
setting.

Bug: 1008939
Change-Id: I2f5d876c9139122673e103fb31a425a61398bdbd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2452129Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Commit-Queue: Julie Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#818768}