[Bleeding] Remove redundant chunkList from ChunkProviderServer

This ArrayList duplicates part of the functionality of the much more
efficient chunk map so can be removed as the map can be used in the few
places this was needed.

src/main/java/org/bukkit/craftbukkit/CraftWorld.java

@@ -164,7 +164,9 @@ public class CraftWorld implements World {
         if (chunk.mustSave) {   // If chunk had previously been queued to save, must do save to avoid loss of that data
             save = true;
         }
+
         chunk.removeEntities(); // Always remove entities - even if discarding, need to get them out of world table
+
         if (save && !(chunk instanceof EmptyChunk)) {
             world.chunkProviderServer.saveChunk(chunk);
             world.chunkProviderServer.saveChunkNOP(chunk);
@@ -172,7 +174,6 @@ public class CraftWorld implements World {
 
         world.chunkProviderServer.unloadQueue.remove(x, z);
         world.chunkProviderServer.chunks.remove(x, z);
-        world.chunkProviderServer.chunkList.remove(chunk);
 
         return true;
     }
@@ -242,7 +243,6 @@ public class CraftWorld implements World {
     private void chunkLoadPostProcess(net.minecraft.server.Chunk chunk, int x, int z) {
         if (chunk != null) {
             world.chunkProviderServer.chunks.put(x, z, chunk);
-            world.chunkProviderServer.chunkList.add(chunk);
 
             chunk.addEntities();