Remove unused methods

app/helpers/nav_helper.rb

@@ -3,20 +3,6 @@ module NavHelper
     cookies[:collapsed_nav] == 'true'
   end
 
-  def sidebar_gutter_collapsed_class
-    if current_path?('merge_requests#diffs') || 
-      cookies[:collapsed_gutter] == 'true'
-      "right-sidebar-collapsed"
-    else
-      "right-sidebar-expanded"
-    end
-  end
-
-  def sidebar_gutter_collapsed?
-    current_path?('merge_requests#diffs') || 
-      cookies[:collapsed_gutter] == 'true'
-  end
-
   def nav_sidebar_class
     if nav_menu_collapsed?
       "sidebar-collapsed"
@@ -44,8 +30,6 @@ module NavHelper
       else
         "page-gutter right-sidebar-expanded"
       end
-    elsif current_path?('merge_requests#diffs')
-      "page-gutter right-sidebar-collapsed"
     end
   end