Looks like it was a member of the IConnection interface and was removed from this interface as part of a fix for bug #2273 in changeset #19c75aae0a60027bb04b098c387ae37e7c1e1e6f by @abnanda1. I don't have the context why it was necessary/recommended but the code has changed since then so it might be possible to put it back to the IConnection interface. I will open a bug for this.