3b77a0cc23
It has been superseded by std::optional. (Also removes some PRESUBMITs against StringPiece while I'm touching that block, since that's gone too.) Bug: 40288126 Change-Id: I8941f1bb75652a4bbb50e95026ea9b6d0ea5ecda Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5805666 Auto-Submit: Peter Kasting <pkasting@chromium.org> Commit-Queue: Peter Kasting <pkasting@chromium.org> Commit-Queue: Lei Zhang <thestig@chromium.org> Reviewed-by: Lei Zhang <thestig@chromium.org> Owners-Override: Lei Zhang <thestig@chromium.org> Cr-Commit-Position: refs/heads/main@{#1345168}