Harald Alvestrand 5aaec9d0a4 Remove has_slots from a class that does not need it
sigslot::has_slots<> is only needed in the class that listens to
signals, not the class that sends it.

Bug: webrtc:11943
Change-Id: I387057c7e1f999a260eade7b5e38a0df5ee0f40a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/192382
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32574}
2020-11-10 13:23:33 +00:00
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