spec: fix EventStream::Record for rails 3

Change-Id: I3da51be4088f9508e107a06070a971d70e55587f
Reviewed-on: https://gerrit.instructure.com/29630
Reviewed-by: Cody Cutrer <cody@instructure.com>
Tested-by: Jenkins <jenkins@instructure.com>
Product-Review: Ryan Florence <ryanf@instructure.com>
QA-Review: Ryan Florence <ryanf@instructure.com>