Remove new nav refs.

app/views/projects/issues/_head.html.haml

@@ -27,11 +27,6 @@
               %span
                 Labels
 
-        - if EE::Gitlab::ServiceDesk.enabled?(project: @project)
-          = nav_link(controller: :issues, action: :service_desk ) do
-            = link_to service_desk_project_issues_path(@project), title: 'Service Desk' do
-              %span Service Desk
-
         - if project_nav_tab? :milestones
           = nav_link(controller: :milestones) do
             = link_to project_milestones_path(@project), title: 'Milestones' do

ee/app/views/projects/issues/service_desk.html.haml

@@ -9,17 +9,15 @@
   = webpack_bundle_tag 'service_desk_issues'
   = webpack_bundle_tag 'issues'
 
-
-- if show_new_nav?
-  - content_for :breadcrumbs_extra do
-    = render "projects/issues/nav_btns", show_export_button: false, show_rss_button: false
+- content_for :breadcrumbs_extra do
+  = render "projects/issues/nav_btns", show_export_button: false, show_rss_button: false
 
 - support_bot_attrs = User.support_bot.to_json(only: [:id, :name, :username, :avatar_url])
 
 %div{ class: "#{container_class} js-service-desk-issues service-desk-issues", data: { support_bot: support_bot_attrs } }
   .top-area
     = render 'shared/issuable/nav', type: :issues
-    .nav-controls{ class: ("visible-xs" if show_new_nav?) }
+    .nav-controls.visible-xs
       = render "projects/issues/nav_btns", show_export_button: false, show_rss_button: false
   = render 'shared/issuable/search_bar', type: :issues