Use OrderContents in LineItemsController and move enterprise fee updating logic

app/controllers/api/v0/shipments_controller.rb

@@ -81,7 +81,6 @@ module Api
         quantity = params[:quantity].to_i
 
         @order.contents.remove(variant, quantity, @shipment)
-        @order.recreate_all_fees!
         @shipment.reload if @shipment.persisted?
 
         render json: @shipment, serializer: Api::ShipmentSerializer, status: :ok

app/controllers/line_items_controller.rb

@@ -39,12 +39,9 @@ class LineItemsController < BaseController
   def destroy_with_lock(item)
     order = item.order
     order.with_lock do
-      item.destroy
+      order.contents.remove(item.variant)
       order.update_shipping_fees!
       order.update_payment_fees!
-      order.update_order_fees!
-      order.update_order!
-      order.create_tax_charge!
     end
   end
 end

app/models/spree/order_contents.rb

@@ -22,6 +22,7 @@ module Spree
     def remove(variant, quantity = nil, shipment = nil)
       line_item = remove_from_line_item(variant, quantity, shipment)
       update_shipment(shipment)
+      order.update_order_fees! if order.completed?
       update_order
       line_item
     end