Remove public idempotent_replayed message (#1553)

Author: helenye-stripe

lib/stripe/errors.rb

@@ -31,13 +31,6 @@ def construct_error_object
       ErrorObject.construct_from(@json_body[:error], {}, nil, :v1)
     end
 
-    # Whether the error was the result of an idempotent replay, meaning that it
-    # originally occurred on a previous request and is being replayed back
-    # because the user sent the same idempotency key for this one.
-    def idempotent_replayed?
-      @idempotent_replayed
-    end
-
     def to_s
       status_string = @http_status.nil? ? "" : "(Status #{@http_status}) "
       id_string = @request_id.nil? ? "" : "(Request #{@request_id}) "

test/stripe/errors_test.rb

@@ -17,12 +17,12 @@ class StripeErrorTest < Test::Unit::TestCase
       context "#idempotent_replayed?" do
         should "initialize from header" do
           e = StripeError.new("message", http_headers: { "idempotent-replayed" => "true" })
-          assert_equal true, e.idempotent_replayed?
+          assert_equal true, e.instance_variable_get(:@idempotent_replayed)
         end
 
         should "be 'falsey' by default" do
           e = StripeError.new("message")
-          refute_equal true, e.idempotent_replayed?
+          refute_equal true, e.instance_variable_get(:@idempotent_replayed)
         end
       end