[react-native] Update graceful-fs and use it in _build_bundle.js

package.json

@@ -54,7 +54,7 @@
     "chalk": "1.0.0",
     "connect": "2.8.3",
     "debug": "2.1.0",
-    "graceful-fs": "3.0.6",
+    "graceful-fs": "4.1.2",
     "image-size": "0.3.5",
     "immutable": "^3.7.4",
     "joi": "5.1.0",

packager/react-packager/index.js

@@ -58,14 +58,7 @@ exports.getDependencies = function(options, main) {
 function useGracefulFs() {
   var fs = require('fs');
   var gracefulFs = require('graceful-fs');
-
-  // A bit sneaky but it's not straightforward to update all the
-  // modules we depend on.
-  Object.keys(fs).forEach(function(method) {
-    if (typeof fs[method] === 'function' && gracefulFs[method]) {
-      fs[method] = gracefulFs[method];
-    }
-  });
+  gracefulFs.gracefulify(fs);
 }
 
 function createServer(options) {