fix error_report_spec for rails 3

Change-Id: I167be7022746c3c7842485aa83073bbba6b239b8
Reviewed-on: https://gerrit.instructure.com/30999
Tested-by: Jenkins <jenkins@instructure.com>
Reviewed-by: Cody Cutrer <cody@instructure.com>
Product-Review: James Williams  <jamesw@instructure.com>
QA-Review: James Williams  <jamesw@instructure.com>