Tomas Gunnarsson 6da271844c Avoid deallocating the async invoker when clearing the transport.
Deallocating the async invoker is a costly operation
but it's also unnecessary and could cause us to miss signal
events.

The data_channel_transport and data_channel_transport_invoker
are (despite the name) not related, since the latter is
used to signal events on the signaling thread whereas the
former deals with the data.

Bug: webrtc:11908
Change-Id: I37b345476a6381aef5d87807877ec1e05b380137
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/184062
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Tommi <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32096}
2020-09-14 12:51:12 +00:00
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