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settings.pages is used outside of pages_settings.js for 3 reasons:
(1) To send page numbers to the PDF plugin
(2) To set the page count in the print header
(3) To set the page count in the print ticket

During the development of the N-up printing feature it has become
clear that the n-up pages need to be used in place of the original
document page indices in all 3 of these locations, so we should set
settings.pages to the n-up values.

Note that the print preview ticket still needs to use the page
indices for the original document, in order to know what pages
should be included in the preview. However, since PrintPreviewHandler
expects this setting to be in ranges format, the print preview
ticket uses settings.ranges, which this CL keeps the same as before
(i.e. using the original document's page numbers).

Bug: None
Change-Id: Ieaad8d75e5125c0dac185f407c665b336aaf4334
Reviewed-on: https://chromium-review.googlesource.com/1174704Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Scott Chen <scottchen@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584633}