Backport with_forgery_protection spec helper

spec/support/forgery_protection.rb

-RSpec.configure do |config|
-  config.around(:each, :allow_forgery_protection) do |example|
-    begin
+module ForgeryProtection
+  def with_forgery_protection
     ActionController::Base.allow_forgery_protection = true
-
-      example.call
+    yield
   ensure
     ActionController::Base.allow_forgery_protection = false
   end
+
+  module_function :with_forgery_protection
+end
+
+RSpec.configure do |config|
+  config.around(:each, :allow_forgery_protection) do |example|
+    ForgeryProtection.with_forgery_protection do
+      example.call
+    end
   end
 end