chromeos: removes quick_launch

And the mash directory. These aren't useful, and having these around means we
need some unnecessary complexity. I converted the one that test that was using
these to instead launch shortcut_viewer.

BUG=none
TEST=none

Change-Id: I6aff493bfd560c8c93dba496690313c715a8cf06
Reviewed-on: https://chromium-review.googlesource.com/c/1462116
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#631013}
53 files changed