Fix jsaction tests for FF57: [] This will also fix transient failures like: []
Fix jsaction tests for FF57:
[]
This will also fix transient failures like:
[]

External bug: https://github.com/google/jsaction/issues/12

RELNOTES: Fix keyboard event for FF57.

	Change on 2017/11/21 by yichao <yichao@google.com>

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=176528018

google/jsaction,google/jsaction