This reverts commit e779847fb6499ac2dc4757de8c625ac377e9d0d4. Reason for revert: Breaks downstream projects, depending on indirect include. Original change's description: > Change SimpleStringBuilder::Append to not use strcpyn and SIZE_UNKNOWN > > Also add explicit includes of rtc_base/string_utils.h in files depending on it. > > Bug: webrtc:6424 > Change-Id: Id6b53937ab2d185d092a5d8863018fd5f1a88e27 > Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/135744 > Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> > Commit-Queue: Niels Moller <nisse@webrtc.org> > Cr-Commit-Position: refs/heads/master@{#27903} TBR=kwiberg@webrtc.org,nisse@webrtc.org Change-Id: Ib04280d401b66fe832d3fdc9293e39276710f973 No-Presubmit: true No-Tree-Checks: true No-Try: true Bug: webrtc:6424 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/135945 Reviewed-by: Niels Moller <nisse@webrtc.org> Commit-Queue: Niels Moller <nisse@webrtc.org> Cr-Commit-Position: refs/heads/master@{#27909}