Gas tile overlay state handling changes (#12691)

Content.Shared/Atmos/EntitySystems/SharedGasTileOverlaySystem.cs

@@ -1,5 +1,4 @@
 using Content.Shared.Atmos.Prototypes;
-using Content.Shared.GameTicking;
 using Robust.Shared.Prototypes;
 using Robust.Shared.Serialization;
 
@@ -21,8 +20,6 @@ namespace Content.Shared.Atmos.EntitySystems
         {
             base.Initialize();
 
-            SubscribeLocalEvent<RoundRestartCleanupEvent>(Reset);
-
             List<int> visibleGases = new();
 
             for (var i = 0; i < Atmospherics.TotalNumberOfGases; i++)
@@ -35,8 +32,6 @@ namespace Content.Shared.Atmos.EntitySystems
             VisibleGasId = visibleGases.ToArray();
         }
 
-        public abstract void Reset(RoundRestartCleanupEvent ev);
-
         public static Vector2i GetGasChunkIndices(Vector2i indices)
         {
             return new((int) MathF.Floor((float) indices.X / ChunkSize), (int) MathF.Floor((float) indices.Y / ChunkSize));