GitLab

Lint no longer requires manifest_package to be specified, so remove this
arg from lint.py as well as the gn templates.

Bug: 1108791
Change-Id: I4b48dc1ce3eb40ef8b4e703ca4ece475f2d28c4b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2339929
Commit-Queue: Peter Wen <wnwen@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Auto-Submit: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796425}