Convert some CommonJS constructs to ES6

Summary:
Tried to automate this with [cjs-to-es6](https://github.com/nolanlawson/cjs-to-es6) but it only
works on vanilla JS files without any special Flow syntax. I converted some places
manually but we can just do the rest as we modify the files.

Reviewed By: jknoxville

Differential Revision: D16340187

fbshipit-source-id: b55c7ce2d719876e47e85f5f3fce13b8c8ae4010

src/ui/components/data-inspector/utils.js

@@ -5,7 +5,7 @@
  * @format
  */
 
-const naturalCompare = require('string-natural-compare');
+import naturalCompare from 'string-natural-compare';
 
 export function getSortedKeys(obj: Object): Array<string> {
   return Object.keys(obj).sort(naturalCompare);