Move suggested_filename from begin to common nav params

R=mkwst@chromium.org,clamy@chromium.org

Bug: 714373
Change-Id: Ib0b8fd1ee8fc2118e6d4e0b11ae5e19dd99b8066
Reviewed-on: https://chromium-review.googlesource.com/880721
Commit-Queue: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531217}
17 files changed