Remove invalid comment.
This was added in 1076aa50a8ffa4f5ab50369807527542a7b87372 when
ember-rails was installed from a revision number. This was changed to
use the latest gem release in ad6705cca759c6b8d40330d24d981190623cdc43
Merge pull request #1889 from et/remove-invalid-comment

Remove invalid comment.