remove api that was scheduled for removal

patches/server/0304-PlayerDeathEvent-shouldDropExperience.patch

@@ -0,0 +1,19 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Shane Freeder <theboyetronic@gmail.com>
+Date: Tue, 24 Dec 2019 00:35:42 +0000
+Subject: [PATCH] PlayerDeathEvent#shouldDropExperience
+
+
+diff --git a/src/main/java/net/minecraft/server/level/ServerPlayer.java b/src/main/java/net/minecraft/server/level/ServerPlayer.java
+index b7419b254295b3b2575ce2c6b5e53b1f3f9a3c41..4fe3106379d693e9a61306f284ebab5a4fe68ae5 100644
+--- a/src/main/java/net/minecraft/server/level/ServerPlayer.java
++++ b/src/main/java/net/minecraft/server/level/ServerPlayer.java
+@@ -1020,7 +1020,7 @@ public class ServerPlayer extends net.minecraft.world.entity.player.Player {
+             this.tellNeutralMobsThatIDied();
+         }
+         // SPIGOT-5478 must be called manually now
+-        this.dropExperience(damageSource.getEntity());
++        if (event.shouldDropExperience()) this.dropExperience(damageSource.getEntity()); // Paper - tie to event
+         // we clean the player's inventory after the EntityDeathEvent is called so plugins can get the exact state of the inventory.
+         if (!event.getKeepInventory()) {
+             // Paper start - PlayerDeathEvent#getItemsToKeep