This =default declaration has no effect other than to break designated initialization in C++20 by making the type no longer an aggregate. Bug: None Change-Id: I20a4c285b7cbfed074291b9ee27c03aa29bada32 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/281960 Reviewed-by: Erik Språng <sprang@webrtc.org> Reviewed-by: Danil Chapovalov <danilchap@webrtc.org> Commit-Queue: Taylor Brandstetter <deadbeef@webrtc.org> Cr-Commit-Position: refs/heads/main@{#38573}