refactor: remove unnecessary code (#500)

Author: 38elements

packages/create-instance/create-instance.js

@@ -11,7 +11,6 @@ import { throwError } from 'shared/util'
 import { compileTemplate } from './compile-template'
 import deleteoptions from './delete-mounting-options'
 import createFunctionalComponent from './create-functional-component'
-import cloneDeep from 'lodash/cloneDeep'
 import { componentNeedsCompiling } from 'shared/validators'
 
 export default function createInstance (
@@ -58,9 +57,6 @@ export default function createInstance (
   addAttrs(vm, options.attrs)
   addListeners(vm, options.listeners)
 
-  vm.$_mountingOptionsSlots = options.slots
-  vm.$_originalSlots = cloneDeep(vm.$slots)
-
   if (options.slots) {
     addSlots(vm, options.slots)
   }