Reapply a lost change from facebook#1233 during rebase

Author: rricard

packages/react-scripts/config/webpack.config.prod.js

@@ -15,7 +15,6 @@ var HtmlWebpackPlugin = require('html-webpack-plugin');
 var ExtractTextPlugin = require('extract-text-webpack-plugin');
 var ManifestPlugin = require('webpack-manifest-plugin');
 var InterpolateHtmlPlugin = require('react-dev-utils/InterpolateHtmlPlugin');
-var SubresourceIntegrityPlugin = require('webpack-subresource-integrity');
 var FlowTypecheckPlugin = require('react-dev-utils/FlowTypecheckPlugin');
 var url = require('url');
 var paths = require('./paths');
@@ -271,10 +270,6 @@ module.exports = {
     new ManifestPlugin({
       fileName: 'asset-manifest.json'
     }),
-    // Generate and inject subresources hashes in the final `index.html`.
-    new SubresourceIntegrityPlugin({
-      hashFuncNames: ['sha256', 'sha384']
-    }),
     // Run Flow only if we see some @ flow annotations, will error on CI
     new FlowTypecheckPlugin({
       otherFlowTypedDefs: {