Change TcpMessageRoute::SendMessage to use AnyInvocable.

This allows us to capture move-only types in lambdas passed in.

Bug: None
Change-Id: I7265b5223c5d1b076bac0e11344c0cfabce37b62
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/387103
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#44433}