Update apt cookbook

cookbooks/apt/libraries/helpers.rb

@@ -1,8 +1,8 @@
 #
-# Cookbook Name:: apt
+# Cookbook:: apt
 # Library:: helpers
 #
-# Copyright 2013 Chef Software, Inc.
+# Copyright:: 2013-2017, Chef Software, Inc.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -27,18 +27,6 @@ module Apt
       !which('apt-get').nil?
     end
 
-    # Determines whether we need to run `apt-get update`
-    #
-    # @return [Boolean]
-    def apt_up_to_date?
-      if ::File.exist?('/var/lib/apt/periodic/update-success-stamp') &&
-         ::File.mtime('/var/lib/apt/periodic/update-success-stamp') > Time.now - node['apt']['periodic_update_min_delay']
-        true
-      else
-        false
-      end
-    end
-
     # Finds a command in $PATH
     #
     # @return [String, nil]