Consolidate worker-targetting webpack config in common

This changes the production config. Spooky scary!

webpack.dev.config.js

@@ -7,10 +7,12 @@ var path = require('path');
 var webpack = require('webpack');
 // TODO: remove once common worker settings moved into common
 var BundleTracker = require('webpack-bundle-tracker');
+var _ = require('underscore');
 
 var commonConfig = require('./webpack.common.config.js');
 
-module.exports = [Merge.smart(commonConfig, {
+module.exports = _.values(Merge.smart(commonConfig, {
+  web: {
     output: {
         filename: '[name].js'
     },
@@ -59,28 +61,4 @@ module.exports = [Merge.smart(commonConfig, {
     watchOptions: {
         ignored: [/node_modules/, /\.git/]
     }
-}),
-{
-  target: "webworker",
-  context: __dirname,
-  entry: {
-    mockprock: './node_modules/edx-proctoring/edx_proctoring/static/proctoring/js/plugin/mockprock-provider.js',
-  },
-  output: {
-    filename: '[name].js',
-    path: path.resolve(__dirname, 'common/static/bundles'),
-  },
-  plugins: [
-    new BundleTracker({
-      path: process.env.STATIC_ROOT_LMS,
-      filename: 'webpack-worker-stats.json'
-    })
-  ],
-  resolve: {
-    extensions: ['.js'],
-    modules: [
-      'node_modules',
-      'node_modules/edx-proctoring/node_modules'
-    ]
-  }
-}];
+}}));