Fix the type error in the IntegrityCheckResultReported proto. Note that

this change is submitted just an hour ago and there are no record on it.
The error occured because of the refactoring from int to long during the
time the review took place.

Test: followed http://go/westworld-local-development and locally verified working
Bug:147095027
Change-Id: Ib48074108ab2454b8c3d2eb457a69be2ddbffa0a