absl::GetFlag creates temporary string which is destroyed and c_str() points to wrong/empty place. Bug: webrtc:10616 Change-Id: Ie17f1530b1042978da78c79bb6754a65ff4e21eb Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/145210 Commit-Queue: Ruslan Burakov <kuddai@google.com> Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Reviewed-by: Ivo Creusen <ivoc@webrtc.org> Cr-Commit-Position: refs/heads/master@{#28529}