remove commented callback code

vendor/travis-core/lib/travis/model/user.rb

@@ -17,7 +17,6 @@ class User < Travis::Model
 
   before_create :set_as_recent
   after_create :create_a_token
-  # after_commit :sync, on: :create
   before_save :track_previous_changes
 
   serialize :github_scopes
@@ -66,10 +65,6 @@ class User < Travis::Model
     synced_at.nil?
   end
 
-  # def sync
-  #   Travis.run_service(:sync_user, self) # TODO move to the authentication endpoint, or create a separate service
-  # end
-
   def syncing?
     is_syncing?
   end