Remove reference to long deleted class.
Remove reference to long deleted class.

RELNOTES:n/a

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=267189436

lucidsoftware/closure-library,lucidsoftware/closure-library,lucidsoftware/closure-library,lucidsoftware/closure-library,google/closure-library,google/closure-library,google/closure-library,google/closure-library,google/closure-library