Webpack 4.0.1 | WebWorker `window is not defined`

**Do you want to request a *feature* or report a *bug*?**

Bug 🐛

**What is the current behavior?**

When requiring web-worker (using [worker-loader](https://github.com/webpack-contrib/worker-loader)) recieve error `Uncaught ReferenceError: window is not defined`.

<details>
<summary>First ~50 lines of built worker file</summary>

```javascript
/******/ (function(modules) { // webpackBootstrap
/******/ 	var parentHotUpdateCallback = window["webpackHotUpdate"];
/******/ 	window["webpackHotUpdate"] = // eslint-disable-next-line no-unused-vars
/******/ 	function webpackHotUpdateCallback(chunkId, moreModules) {
/******/ 		hotAddUpdateChunk(chunkId, moreModules);
/******/ 		if (parentHotUpdateCallback) parentHotUpdateCallback(chunkId, moreModules);
/******/ 	} ;
/******/
/******/ 	// eslint-disable-next-line no-unused-vars
/******/ 	function hotDownloadUpdateChunk(chunkId) {
/******/ 		importScripts(__webpack_require__.p + "" + chunkId + "." + hotCurrentHash + ".hot-update.js");
/******/ 	}
/******/
/******/ 	// eslint-disable-next-line no-unused-vars
/******/ 	function hotDownloadManifest(requestTimeout) {
/******/ 		requestTimeout = requestTimeout || 10000;
/******/ 		return new Promise(function(resolve, reject) {
/******/ 			if (typeof XMLHttpRequest === "undefined")
/******/ 				return reject(new Error("No browser support"));
/******/ 			try {
/******/ 				var request = new XMLHttpRequest();
/******/ 				var requestPath = __webpack_require__.p + "" + hotCurrentHash + ".hot-update.json";
/******/ 				request.open("GET", requestPath, true);
/******/ 				request.timeout = requestTimeout;
/******/ 				request.send(null);
/******/ 			} catch (err) {
/******/ 				return reject(err);
/******/ 			}
/******/ 			request.onreadystatechange = function() {
/******/ 				if (request.readyState !== 4) return;
/******/ 				if (request.status === 0) {
/******/ 					// timeout
/******/ 					reject(
/******/ 						new Error("Manifest request to " + requestPath + " timed out.")
/******/ 					);
/******/ 				} else if (request.status === 404) {
/******/ 					// no update available
/******/ 					resolve();
/******/ 				} else if (request.status !== 200 && request.status !== 304) {
/******/ 					// other failure
/******/ 					reject(new Error("Manifest request to " + requestPath + " failed."));
/******/ 				} else {
/******/ 					// success
/******/ 					try {
/******/ 						var update = JSON.parse(request.responseText);
/******/ 					} catch (e) {
/******/ 						reject(e);
/******/ 						return;
/******/ 					}
/******/ 					resolve(update);
/******/ 				}
/******/ 			};
/******/ 		});
/******/ 	}

// More code... (think it's irrelevant)
```

</details>

<img width="1770" alt="screen shot 2018-03-01 at 23 12 59" src="https://user-images.githubusercontent.com/3515099/36869973-29953504-1da6-11e8-9043-d48d52aa1bf2.png">

**What is the expected behavior?**

To inject right template for web-workers that won't include/use `window` element.

**Please mention other relevant information such as the browser version, Node.js version, webpack version, and Operating System.**

> I'm using `electron-render` as webpack build target. Tried changing it to `web` and inspecting the worker file, **but still didn't work!**

- Webpack config (filtered):

	```javascript
	{
	  mode: 'development',
	  devtool: 'eval-source-map',
	  target: 'electron-renderer',
	  entry: [
	    'react-hot-loader/patch',
	    path.join(__dirname, 'src/index.js'),
	    'webpack-hot-middleware/client?reload=true&path=http://localhost:3000__webpack_hmr&overlay=false'
	  ],
	  output: {
	    path: path.join(__dirname, 'dist'),
	    filename: 'bundle.js'
	    publicPath: 'http://localhost:3000'
	  },
	  module: {
	    rules: [
	      {
	        enforce: 'pre',
	        test: /\.js$/i,
	        exclude: /node_modules/,
	        use: {
	          loader: 'eslint-loader',
	          options: {
	            fix: true,
	            failOnWarning: false,
	            failOnError: false
	          }
	        }
	      },
	      {
	        test: /\.worker.js$/i,
	        exclude: /node_modules/,
	        use: [
	          'worker-loader'
	        ]
	      },
	      {
	        test: /\.js$/i,
	        exclude: /node_modules/,
	        use: [
	          'babel-loader'
	        ]
	      },
	      // ...
	    ]
	  },
	  resolve: {
	    modules: [
	      path.resolve('./src'),
	      'node_modules'
	    ]
	  },
      plugins: [
    	new webpack.HotModuleReplacementPlugin(),
    	new webpack.NamedModulesPlugin(),
    	new webpack.DefinePlugin({
      	  'process.env.NODE_ENV': JSON.stringify('development')
		})
	  ]
	}
	```

- NPM Packages (filtered):
	```
	"electron": "2.0.0-beta.1"
	"react-hot-loader": "4.0.0"
	"webpack": "4.0.1"
	"webpack-cli": "2.0.9"
	"webpack-dev-middleware": "3.0.0"
	"webpack-hot-middleware": "2.21.1"
	"webpack-merge": "4.1.2"
	"worker-loader": "1.1.1"
	``` 
- Operating System: OSX `10.12.6`
- Node.js: `v9.5.0`

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Webpack 4.0.1 | WebWorker `window is not defined` #6642

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Webpack 4.0.1 | WebWorker `window is not defined` #6642