Revert "Emit ES6 code for module source in emit file load" (#2501)

* Revert "Update emotion example to use css instead of fragment (#2497)"

This reverts commit 5bd3a5f.

* Revert "Fix "Deploy to now" link (#2489)"

This reverts commit df1cd7e.

* Revert "Emit ES6 code for module source in emit file load (#2478)"

This reverts commit 3f50abc.

server/build/loaders/emit-file-loader.js

@@ -12,7 +12,7 @@ module.exports = function (content, sourceMap) {
 
   const emit = (code, map) => {
     this.emitFile(interpolatedName, code, map)
-    this.callback(null, content, sourceMap)
+    this.callback(null, code, map)
   }
 
   if (query.transform) {