GitLab

See https://codereview.chromium.org/18024002 for a similar example.

Note that this API doesn't work on UNIX, so we still need an in-app method of
opening a new window.

BUG=252881
R=lambroslambrou@chromium.org

Review URL: https://codereview.chromium.org/23536033

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@221852 0039d316-1c4b-4281-b951-d872f2087c98