Fix variable type mismatch.
uint64_t and size_t are not the same type on some Chromium platforms.
gfe-relnote: no behavior change. Not protected.
PiperOrigin-RevId: 281602900
Change-Id: Ibe1e4aa62860eb981df05a795d883821d93d13ef
QUICHE (QUIC, Http/2, Etc) is Google‘s implementation of QUIC and related protocols. It powers Chromium as well as Google’s QUIC servers and some other projects.