Summary: I've been confused for a long time by this, and I think it's better late than never. I propose we rename that file to make it more explicit where that class lives, and so that it's consistent with the test file, name `DependencyGraph-test.js`
Reviewed By: davidaurelio
Differential Revision: D5020556
fbshipit-source-id: d54a501c3995f3fea16a5bfc6ca72993f73c4873