Use emoji assets on autocomplete.

app/assets/javascripts/gfm_auto_complete.js.coffee

@@ -6,7 +6,6 @@ GitLab.GfmAutoComplete =
   dataSource: ''
   # Emoji
   Emoji:
-    assetBase: ''
     template: '<li data-value="${insert}">${name} <img alt="${name}" height="20" src="${image}" width="20" /></li>'
 
   # Team Members
@@ -27,7 +26,7 @@ GitLab.GfmAutoComplete =
       tpl: @Emoji.template
       callbacks:
         before_save: (emojis) =>
-          $.map emojis, (em) => name: em, insert: em+ ':', image: "#{@Emoji.assetBase}/#{em}.png"
+          $.map emojis, (em) => name: em.name, insert: em.name+ ':', image: em.path
 
     # Team Members
     input.atwho

app/controllers/projects_controller.rb

@@ -124,7 +124,7 @@ class ProjectsController < ApplicationController
 
   def autocomplete_sources
     @suggestions = {
-      emojis: Emoji.names,
+      emojis: Emoji.names.map { |e| { name: e, path: view_context.image_url("emoji/#{e}.png") } },
       issues: @project.issues.select([:iid, :title, :description]),
       mergerequests: @project.merge_requests.select([:iid, :title, :description]),
       members: @project.team.members.sort_by(&:username).map { |user| { username: user.username, name: user.name } }

app/views/layouts/_init_auto_complete.html.haml

 :javascript
   GitLab.GfmAutoComplete.dataSource = "#{autocomplete_sources_project_path(@project)}"
-  GitLab.GfmAutoComplete.Emoji.assetBase = "#{Gitlab.config.gitlab.relative_url_root + Emoji.asset_path}"
   GitLab.GfmAutoComplete.setup();