add polyfill for ChildNode remove

package.json

@@ -109,6 +109,7 @@
     "cache-loader": "1.0.3",
     "chalk": "^2.4.1",
     "check-hash": "1.0.1",
+    "childnode-remove": "^1.0.1",
     "color": "1.0.3",
     "commander": "2.8.1",
     "compare-versions": "3.1.0",

src/core_plugins/tests_bundle/tests_entry_template.js

@@ -34,6 +34,7 @@ import 'babel-polyfill';
 import 'custom-event-polyfill';
 import 'whatwg-fetch';
 import 'abortcontroller-polyfill';
+import 'childnode-remove';
 
 import { CoreSystem } from '__kibanaCore__'
 

src/ui/ui_bundles/app_entry_template.js

@@ -31,6 +31,7 @@ import 'babel-polyfill';
 import 'custom-event-polyfill';
 import 'whatwg-fetch';
 import 'abortcontroller-polyfill';
+import 'childnode-remove';
 
 import { CoreSystem } from '__kibanaCore__'
 

webpackShims/childnode-remove.js

@@ -0,0 +1,22 @@
+/*
+ * Licensed to Elasticsearch B.V. under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch B.V. licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+const childNodeRemove = require('childnode-remove');
+
+childNodeRemove.polyfill();

yarn.lock

@@ -2665,6 +2665,10 @@ cheerio@^1.0.0-rc.2:
     lodash "^4.15.0"
     parse5 "^3.0.1"
 
+childnode-remove@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/childnode-remove/-/childnode-remove-1.0.1.tgz#a3b3aa81a824eb45f4d66bb88f58a330f76068b5"
+
 [email protected]:
   version "1.6.0"
   resolved "https://registry.yarnpkg.com/chokidar/-/chokidar-1.6.0.tgz#90c32ad4802901d7713de532dc284e96a63ad058"