Revoke deprecation of "reliable"

It was too hard to find all the occurences.

Bug: None
Change-Id: I7e4868231a14005f6ae72da5e75458919da11e5e
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/409140
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#45638}
diff --git a/api/data_channel_interface.h b/api/data_channel_interface.h
index e9c0c78..1dc737f 100644
--- a/api/data_channel_interface.h
+++ b/api/data_channel_interface.h
@@ -37,7 +37,7 @@
 struct DataChannelInit {
   // Deprecated. Reliability is assumed, and channel will be unreliable if
   // maxRetransmitTime or MaxRetransmits is set.
-  [[deprecated]] bool reliable = false;
+  bool reliable = false;
 
   // True if ordered delivery is required.
   bool ordered = true;