Niels Möller e779847fb6 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}
2019-05-10 08:38:42 +00:00
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