Screw commit history.

code/modules/antagonists/overthrow/overthrow_converter.dm

@@ -9,7 +9,7 @@
 	throw_speed = 3
 	throw_range = 5
 	w_class = WEIGHT_CLASS_SMALL
-	materials = list(MAT_METAL=600, MAT_GLASS=200)
+	custom_materials = list(/datum/material/iron=600, /datum/material/glass=200)
 	var/uses = 2
 
 /obj/item/overthrow_converter/proc/convert(mob/living/carbon/human/target, mob/living/carbon/human/user) // Should probably also delete any mindshield implant. Not sure.

code/modules/antagonists/swarmer/swarmer.dm

@@ -4,7 +4,7 @@
 	desc = "A shell of swarmer that was completely powered down. It can no longer activate itself."
 	icon = 'icons/mob/swarmer.dmi'
 	icon_state = "swarmer_unactivated"
-	materials = list(MAT_METAL=10000, MAT_GLASS=4000)
+	custom_materials = list(/datum/material/iron=10000, /datum/material/glass=4000)
 
 /obj/effect/mob_spawn/swarmer
 	name = "unactivated swarmer"
@@ -190,7 +190,7 @@
 	return 0
 
 /obj/item/IntegrateAmount() //returns the amount of resources gained when eating this item
-	if(materials[MAT_METAL] || materials[MAT_GLASS])
+	if(custom_materials[getmaterialref(/datum/material/iron)] || custom_materials[getmaterialref(/datum/material/glass)])
 		return 1
 	return ..()