Remove monkey patches for rails 3 and ruby 2.4 (#14667)

Remove monkey patches for rails 3 and ruby 2.4

NEWS.md

@@ -19,6 +19,7 @@ Development
 - Adapt current dashboard's request interceptor ([#14489](https://github.com/CartoDB/cartodb/issues/14489))
 - Bulk actions in datasets and maps revised and fixed ([#14700](https://github.com/CartoDB/cartodb/pull/14700))
 - Fix .carto not creating a map in old dashboard ([#14713](https://github.com/CartoDB/cartodb/pull/14713))
+- Remove patches for Rails 3 and ruby 2.4 not longer needed [#14667](https://github.com/CartoDB/cartodb/pull/14667)
 - Reorder Quick actions menu ([CartoDB/product#282](https://github.com/CartoDB/product/issues/282))
 
 4.25.2 (2019-02-25)

config/initializers/02_extensions.rb

@@ -8,32 +8,3 @@ module SequelRails
     @db ||= ::Sequel.synchronize { ::Sequel::DATABASES.first }
   end
 end
-
-# Patches for Ruby 2.4
-# TODO: remove .dup when we no longer support buggy ruby version 2.2.4p230
-if Gem::Version.new(RUBY_VERSION.dup) >= Gem::Version.new("2.4")
-  # ActiveSupport dates, e.g: 3.days (fixed in Rails 5, and no sooner)
-  class ActiveSupport::Duration
-    def coerce(other)
-      [other, to_i]
-    end
-  end
-
-  # ActiveRecord 3.2. Fixed in Arel 7.1.0
-  require 'arel'
-  module Arel
-    module Visitors
-      class Dot
-        alias :visit_Integer :visit_String
-      end
-
-      class ToSql
-        alias :visit_Integer :literal
-      end
-
-      class DepthFirst
-        alias :visit_Integer :terminal
-      end
-    end
-  end
-end