Replace vector of arrays with array of arrays.
Replace vector of arrays with array of arrays.

C++ does not like vectors of arrays (because arrays are not copy-constructable).

PiperOrigin-RevId: 258270980

google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor,google/gvisor