Revert "Merge pull request #11299 from arunagw/disable_implicit_join_references_removed"

`disable_implicit_join_references=` was only deprecated on `master`,
not with rails 4.0. We can remove it after 4.1

This reverts commit 3c719ead, reversing
changes made to d5c3bf97.

activerecord/CHANGELOG.md

-*   Remove deprecated `ActiveRecord::Base.disable_implicit_join_references=`.
-
-    *Arun Agrawal*
-
 *   Remove deprecated nil-passing to the following `SchemaCache` methods:
     `primary_keys`, `tables`, `columns` and `columns_hash`.
 

activerecord/lib/active_record/core.rb

@@ -69,6 +69,11 @@ module Core
       mattr_accessor :timestamped_migrations, instance_writer: false
       self.timestamped_migrations = true
 
+      def self.disable_implicit_join_references=(value)
+        ActiveSupport::Deprecation.warn("Implicit join references were removed with Rails 4.1." \
+                                        "Make sure to remove this configuration because it does nothing.")
+      end
+
       class_attribute :default_connection_handler, instance_writer: false
 
       def self.connection_handler

activerecord/test/cases/relations_test.rb

@@ -1216,6 +1216,12 @@ def test_primary_key
     assert_equal "id", Post.all.primary_key
   end
 
+  def test_disable_implicit_join_references_is_deprecated
+    assert_deprecated do
+      ActiveRecord::Base.disable_implicit_join_references = true
+    end
+  end
+
   def test_ordering_with_extra_spaces
     assert_equal authors(:david), Author.order('id DESC , name DESC').last
   end