Explicitly construct StringPiece from grease data to avoid msan failure.
gfe-relnote: no behavior change. not protected.
PiperOrigin-RevId: 306491242
Change-Id: Iace5c82eeb1a10636a1d1ab76f567bdf470a52ac
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.