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Last portion of a rebase of:
https://chromium-review.googlesource.com/c/chromium/src/+/2443211
by dpapad@
onto the addition of a new resource_path grit property.

This CL updates Print Preview to use the new manifest generation
option in optimize_webui, combined with the resource_path grit
property and generate_grd changes, to autogenerate the grd file
in optimized builds.

Bug: 1132403
Change-Id: I8f03064bbacd0ce993f59cf008ee27112d1934cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2458878
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816217}