This removes limitation of no special chars in patchset titles.

BUG=chromium:663787,chromium:707963,gerrit:5184
R=sergiyb@chromium.org,agable@chromium.org
TEST=uploaded this CL using depot_tools with this patch :)

Change-Id: I5d684d0a0aa286a45ff99cca6d57aefa8436cd0f
Reviewed-on: https://chromium-review.googlesource.com/468926
Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>
Reviewed-by: Sergiy Byelozyorov <sergiyb@google.com>