Switching proto definition to protolite

Test: Presubmit
Bug: 178631736
Change-Id: Iad5a1b38e4d63b644d00a8ee2bae891e24636b8b
1 file changed
tree: 70f4a98eeb2bb65b778bbcf6fdb15d72494a3f8c
  1. stats/