backout v3

synapse/api/constants.py

@@ -119,7 +119,6 @@ KNOWN_ROOM_VERSIONS = {
     RoomVersions.V2,
     RoomVersions.VDH_TEST,
     RoomVersions.STATE_V2_TEST,
-    RoomVersions.V3,
 }
 
 ServerNoticeMsgType = "m.server_notice"

synapse/rest/client/v2_alpha/capabilities.py

@@ -38,7 +38,6 @@ class CapabilitiesRestServlet(RestServlet):
                         "1": "stable",
                         "2": "stable",
                         "state-v2-test": "unstable",
-                        "3": "unstable"
                     }
                 }
             }