Linux native notifications: Add a blank line to separate the origin from the body

This CL adds another newline to separate the notification attribution
from the message body.  Also, it simplifies the logic for adding
newlines so that we don't have to check if there's any text
beforehand.

BUG=676220
R=peter@chromium.org
CC=thestig@chromium.org

Change-Id: I1ec6d7f4a570537bf7b44f03a0de79de52280c07
Reviewed-on: https://chromium-review.googlesource.com/709944
Reviewed-by: Peter Beverloo <peter@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#508406}
2 files changed