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This removes MessageHandler and Thread dependencies from StunRequest and StunRequestManager. Instead the TaskQueueBase abstraction is used for async posting and synchronous Clear() operations removed by using a pending task safety flag. Bug: webrtc:9702 Change-Id: I6e9ed5e1b4c446fd1f91af06e3ab36bccb5d7320 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/265060 Reviewed-by: Harald Alvestrand <hta@webrtc.org> Reviewed-by: Niels Moller <nisse@webrtc.org> Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org> Cr-Commit-Position: refs/heads/main@{#37218}