Remove disabled extend.

Library/Homebrew/extend/os/mac/tap.rb

@@ -1,17 +0,0 @@
-# typed: true
-# frozen_string_literal: true
-
-class Tap
-  def self.install_default_cask_tap_if_necessary(force: false)
-    odisabled "Tap.install_default_cask_tap_if_necessary", "CoreCaskTap.ensure_installed!"
-
-    cask_tap = CoreCaskTap.instance
-    return false if cask_tap.installed?
-    return false unless Homebrew::EnvConfig.no_install_from_api?
-    return false if Homebrew::EnvConfig.automatically_set_no_install_from_api?
-    return false if !force && Tap.untapped_official_taps.include?(cask_tap.name)
-
-    cask_tap.install
-    true
-  end
-end

Library/Homebrew/extend/os/tap.rb

@@ -1,4 +0,0 @@
-# typed: strict
-# frozen_string_literal: true
-
-require "extend/os/mac/tap" if OS.mac?

Library/Homebrew/tap.rb

@@ -1458,5 +1458,3 @@ class TapConfig
     Homebrew::Settings.delete key, repo: tap.path
   end
 end
-
-require "extend/os/tap"