Remove references to unstable identifiers from MSC3440. (#12382)

Removes references to unstable thread relation, unstable
identifiers for filtering parameters, and the experimental
config flag.

1 files changed, 0 insertions, 3 deletions

diff --git a/synapse/config/experimental.py b/synapse/config/experimental.py

index 447476fbfa..0772dce411 100644
--- a/synapse/config/experimental.py
+++ b/synapse/config/experimental.py
@@ -26,9 +26,6 @@ class ExperimentalConfig(Config):
     def read_config(self, config: JsonDict, **kwargs: Any) -> None:
         experimental = config.get("experimental_features") or {}
 
-        # MSC3440 (thread relation)
-        self.msc3440_enabled: bool = experimental.get("msc3440_enabled", False)
-
         # MSC3026 (busy presence state)
         self.msc3026_enabled: bool = experimental.get("msc3026_enabled", False)