cull(engine-cleanup): pass-8 phase-2 cascade round 2 after MyPageItemBattle stub

SVSim.BattleEngine/Shim/UnityEngine/UnityShim.cs

@@ -40,7 +40,7 @@ namespace UnityEngine
     public struct Plane { public Plane(Vector3 normal, Vector3 point) { } public Plane(Vector3 inNormal, float d) { } public Plane(Vector3 a, Vector3 b, Vector3 c) { } public bool Raycast(Ray r, out float enter) { enter = 0; return false; } }
     public struct Ray { public Ray(Vector3 origin, Vector3 dir) { this.origin = origin; this.direction = dir; } public Vector3 origin; public Vector3 direction; public Vector3 GetPoint(float d) => origin; }
     public struct RaycastHit { public Vector3 point; public Vector3 normal; public float distance; public Collider collider; }
-    public struct LayerMask { public int value; public static int NameToLayer(string n) => 0; public static string LayerToName(int layer) => ""; public static implicit operator int(LayerMask m) => m.value; public static implicit operator LayerMask(int v) => new LayerMask { value = v }; }
+    public struct LayerMask { public int value; public static int NameToLayer(string n) => 0; public static implicit operator int(LayerMask m) => m.value; public static implicit operator LayerMask(int v) => new LayerMask { value = v }; }
 
     // ---- core object model ----
     public class Object