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This CL converts PrintHostMsg_SetupScriptedPrintPreview message to
SetupScriptedPrintPreview() in mojom::PrintManagerHost.

Bug: 1008939
Change-Id: I52a9a299f975e56f33cdfef65c8be8bfc65bb9dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2607979
Commit-Queue: Julie Kim <jkim@igalia.com>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846003}