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Upstream commit: https://webrtc.googlesource.com/src/+/0ebd67f89d68599179914f445c8ad31967b49933 Move string_builder.h to webrtc namespace Bug: webrtc:42232595 Change-Id: Iad12b11767c3bbaddcf0e87357e8e6037608defb Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/377740 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Commit-Queue: Evan Shrubsole <eshr@webrtc.org> Cr-Commit-Position: refs/heads/main@{#43926} Differential Revision: https://phabricator.services.mozilla.com/D243927