remove unused controller method
remove unused controller method

This should have been removed in
f059ae68f487f03faf07bb5c7ab763205014e0d4

refs TALLY-826
flag = none

test plan:
 * Verify Jenkins passes

Change-Id: Ib22087e6619b6bb90027cffa0d87dbd67e60e23b
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/235028
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
QA-Review: Jeremy Neander <20252aad5efdc666f083d82ab63ed0f9f72a043e@instructure.com>
Reviewed-by: Adrian Packel <9c6a39807293376f29cba17542b4cb1b663ecc4a@instructure.com>
Reviewed-by: Spencer Olson <7cc0890d6f1f70810a023e7173eca5724d6c8e49@instructure.com>
Product-Review: Spencer Olson <7cc0890d6f1f70810a023e7173eca5724d6c8e49@instructure.com>

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