Fix #4111: Cache custom CSS.

app/presenters/user_presenter.rb

@@ -172,14 +172,4 @@ class UserPresenter
   def previous_names(template)
     user.user_name_change_requests.map { |req| template.link_to req.original_name, req }.join(", ").html_safe
   end
-
-  def custom_css
-    user.custom_style.to_s.split(/\r\n|\r|\n/).map do |line|
-      if line =~ /\A@import/
-        line
-      else
-        line.gsub(/([^[:space:]])[[:space:]]*(?:!important)?[[:space:]]*(;|})/, "\\1 !important\\2")
-      end
-    end.join("\n")
-  end
 end