GitLab

This policy is now supported and removing this attribute makes sure
that it is included in the generated documentation.

BUG=368801

Review URL: https://codereview.chromium.org/380183002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@282343 0039d316-1c4b-4281-b951-d872f2087c98