Adding a fetch polyfill (#15968)

* Adding a `fetch` polyfill

* "globally" shimming the whatwg-fetch

package.json

@@ -155,15 +155,15 @@
     "mkdirp": "0.5.1",
     "moment": "2.13.0",
     "moment-timezone": "0.5.4",
-    "ngreact": "0.5.1",
     "mustache": "2.3.0",
+    "ngreact": "0.5.1",
     "no-ui-slider": "1.2.0",
     "node-fetch": "1.3.2",
     "pegjs": "0.9.0",
+    "pivotal-ui": "11.0.0",
     "postcss-loader": "2.0.6",
     "prop-types": "15.5.8",
     "proxy-from-env": "1.0.0",
-    "pivotal-ui": "11.0.0",
     "querystring-browser": "1.0.4",
     "raw-loader": "0.5.1",
     "react": "16.0.0",
@@ -210,6 +210,7 @@
     "vision": "4.1.0",
     "webpack": "3.6.0",
     "webpack-merge": "4.1.0",
+    "whatwg-fetch": "^2.0.3",
     "wreck": "12.4.0",
     "yauzl": "2.7.0"
   },

src/ui/public/chrome/chrome.js

@@ -3,6 +3,7 @@ import angular from 'angular';
 
 import { metadata } from 'ui/metadata';
 import 'babel-polyfill';
+import 'whatwg-fetch';
 import 'ui/timefilter';
 import 'ui/notify';
 import 'ui/private';

yarn.lock

@@ -11675,7 +11675,7 @@ whatwg-encoding@^1.0.1:
   dependencies:
     iconv-lite "0.4.19"
 
-whatwg-fetch@>=0.10.0:
+whatwg-fetch@>=0.10.0, whatwg-fetch@^2.0.3:
   version "2.0.3"
   resolved "https://registry.yarnpkg.com/whatwg-fetch/-/whatwg-fetch-2.0.3.tgz#9c84ec2dcf68187ff00bc64e1274b442176e1c84"