Printing from the system dialog link on Windows causes the preview to
hide. The print preview is stored in the background printing manager
until the print job is reported complete. If this does not occur, the
print preview will never be removed and a DCHECK will be triggered
when the browser is closed. Inform the print view manager when the
system dialog is cancelled so that things can be cleaned up correctly.

Bug: 749317
Change-Id: I993e713f5da0a16b2d20147dd3377db28090ff1e
Reviewed-on: https://chromium-review.googlesource.com/591991


Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#493059}