fix class variable warnings in 1.9.3
fix class variable warnings in 1.9.3

Change-Id: If72525d059f3628ad0071f1c8ceffad91c14af67
Reviewed-on: https://gerrit.instructure.com/10855
Tested-by: Jenkins <d95b56ce41a2e1ac4cecdd398defd7414407cc08@instructure.com>
Reviewed-by: Zach Wily <9de8c4480303b5335cd2a33eefe814615ba3612a@instructure.com>

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