(This is a merge of http://go/wvgerrit/134404.) There were two lines that were tripping Clang's `-Wshorten-64-to-32` warning. This CL makes both conversions explicit to appease the warning. There should be no change in behavior. Bug: 194971260 Test: ODK Unit Tests Change-Id: I6d111e9a4efc1f0e31b51e455c47c0e885d48e6b