Remove deprecated `ActiveRecord::Base.disable_implicit_join_references=`

activerecord/CHANGELOG.md

+*   Remove deprecated `ActiveRecord::Base.disable_implicit_join_references=`.
+
+    *Rafael Mendonça França*
+
 *   Remove deprecated access to connection specification using a string acessor.
 
     Now all strings will be handled as a URL.

activerecord/lib/active_record/core.rb

@@ -87,13 +87,6 @@ def self.configurations
 
       mattr_accessor :maintain_test_schema, instance_accessor: false
 
-      def self.disable_implicit_join_references=(value)
-        ActiveSupport::Deprecation.warn(<<-MSG.squish)
-          Implicit join references were removed with Rails 4.1.
-          Make sure to remove this configuration because it does nothing.
-        MSG
-      end
-
       class_attribute :default_connection_handler, instance_writer: false
       class_attribute :find_by_statement_cache
 

activerecord/test/cases/relations_test.rb

@@ -1382,12 +1382,6 @@ 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