Remove constants deprecation.

railties/lib/rails.rb

@@ -8,7 +8,6 @@ require 'active_support/core_ext/logger'
 
 require 'rails/application'
 require 'rails/version'
-require 'rails/deprecation'
 
 require 'active_support/railtie'
 require 'action_dispatch/railtie'

railties/lib/rails/deprecation.rb

@@ -1,33 +0,0 @@
-require "active_support/string_inquirer"
-require "active_support/basic_object"
-
-module Rails
-  class DeprecatedConstant < ActiveSupport::BasicObject
-    def self.deprecate(old, new)
-      constant = self.new(old, new)
-      eval "::#{old} = constant"
-    end
-
-    def initialize(old, new)
-      @old, @new = old, new
-      @target = ::Kernel.eval "proc { #{@new} }"
-      @warned = false
-    end
-
-    def method_missing(meth, *args, &block)
-      ::ActiveSupport::Deprecation.warn("#{@old} is deprecated. Please use #{@new}") unless @warned
-      @warned = true
-
-      target = @target.call
-      if target.respond_to?(meth)
-        target.send(meth, *args, &block)
-      else
-        super
-      end
-    end
-  end
-
-  DeprecatedConstant.deprecate("RAILS_ROOT",           "::Rails.root.to_s")
-  DeprecatedConstant.deprecate("RAILS_ENV",            "::Rails.env")
-  DeprecatedConstant.deprecate("RAILS_DEFAULT_LOGGER", "::Rails.logger")
-end