Fix use of Emoji

app/helpers/application_helper.rb

@@ -115,7 +115,7 @@ module ApplicationHelper
   def emoji_autocomplete_source
     # should be an array of strings
     # so to_s can be called, because it is sufficient and to_json is too slow
-    Emoji::NAMES.to_s
+    Emoji.names.to_s
   end
 
   def ldap_enable?

lib/gitlab/markdown.rb

@@ -128,7 +128,7 @@ module Gitlab
     #
     # Returns boolean
     def valid_emoji?(emoji)
-      Emoji::NAMES.include? emoji
+      Emoji.names.include? emoji
     end
 
     # Private: Dispatches to a dedicated processing method based on reference