R1:b53d61c90915

Fix bad call to getShortName()

Summary: Fixes T10212. This method was removed in D14990, but I missed a callsite.

Test Plan: Disabling blame now works nicely.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T10212

Differential Revision: https://secure.phabricator.com/D15100