feat(ssr): wrap script in IIFE

Wrap auto-remove script in IIFE so that global scope is not polluted.

vuejs#6761

Author: markbrouch

src/server/template-renderer/index.js

@@ -192,7 +192,7 @@ export default class TemplateRenderer {
       windowKey = '__INITIAL_STATE__'
     } = options || {}
     const autoRemove = process.env.NODE_ENV === 'production'
-      ? 'var s;(s=document.currentScript||document.scripts[document.scripts.length-1]).parentNode.removeChild(s);'
+      ? '(function(){var s;(s=document.currentScript||document.scripts[document.scripts.length-1]).parentNode.removeChild(s);}());'
       : ''
     return context[contextKey]
       ? `<script>window.${windowKey}=${