tzinfo patch no longer needed

we have a newer tzinfo in our gemfile than rails has, so this method
doesn't need patched (it's already been fixed)

Change-Id: I2cee60da0187965f680d73dbe53a0fc751d33984
Reviewed-on: https://gerrit.instructure.com/26598
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Brian Palmer <brianp@instructure.com>
QA-Review: Cody Cutrer <cody@instructure.com>
Product-Review: Cody Cutrer <cody@instructure.com>

config/initializers/ruby_version_compat.rb

@@ -37,38 +37,6 @@ if RUBY_VERSION < '2.0'
 end
 
 if CANVAS_RAILS2
-  # See http://developer.uservoice.com/entries/how-to-upgrade-a-rails-2.3.14-app-to-ruby-1.9.3/
-  # TZInfo needs to be patched.  In particular, you'll need to re-implement the datetime_new! method:
-  require 'tzinfo'
-
-  module TZInfo
-    # Methods to support different versions of Ruby.
-    module RubyCoreSupport #:nodoc:
-      HALF_DAYS_IN_DAY = rational_new!(1, 2)
-
-      # Rails 2.3 defines datetime_new! in terms of methods that don't exist in
-      # Ruby 1.9.3, so we have to redefine it here
-      def self.datetime_new!(ajd = 0, of = 0, sg = Date::ITALY)
-        # Convert from an Astronomical Julian Day number to a civil Julian Day number.
-        jd = ajd + of + HALF_DAYS_IN_DAY
-
-        # Ruby trunk revision 31862 changed the behaviour of DateTime.jd so that it will no
-        # longer accept a fractional civil Julian Day number if further arguments are specified.
-        # Calculate the hours, minutes and seconds to pass to jd.
-
-        jd_i = jd.to_i
-        jd_i -= 1 if jd < 0
-        hours = (jd - jd_i) * 24
-        hours_i = hours.to_i
-        minutes = (hours - hours_i) * 60
-        minutes_i = minutes.to_i
-        seconds = (minutes - minutes_i) * 60
-
-        DateTime.jd(jd_i, hours_i, minutes_i, seconds, of, sg)
-      end
-    end
-  end
-
   require "active_support/core_ext/string/output_safety"
   class ERB
     module Util