Revert "feat(auth/session_controller): Send Clear-Site-Data when logg…

…ing out (8627)" (mastodon#9161)

This reverts commit 10680f9.

app/controllers/auth/sessions_controller.rb

@@ -10,7 +10,6 @@ class Auth::SessionsController < Devise::SessionsController
   prepend_before_action :authenticate_with_two_factor, if: :two_factor_enabled?, only: [:create]
   before_action :set_instance_presenter, only: [:new]
   before_action :set_body_classes
-  after_action :clear_site_data, only: [:destroy]
 
   def new
     Devise.omniauth_configs.each do |provider, config|
@@ -125,14 +124,6 @@ def home_paths(resource)
     paths
   end
 
-  def clear_site_data
-    return if continue_after?
-
-    # Should be '"*"' but that doesn't work in Chrome (neither does '"executionContexts"')
-    # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Clear-Site-Data
-    response.headers['Clear-Site-Data'] = '"cache", "cookies", "storage"'
-  end
-
   def continue_after?
     truthy_param?(:continue)
   end