GitLab

on gtk. This is a revert of most of r52070and 51478. I've kept parts
of these changes we want in though: comments, nuking nano tab gap on
views, having app tabs use a bigger icon.

BUG=49013
TEST=none

Review URL: http://codereview.chromium.org/3011007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@52830 0039d316-1c4b-4281-b951-d872f2087c98