fix(XHR.responseBlob): don't access XHR.responseBlob on old android webkit (#329)

Author: Kombu

Diff for: lib/common/utils.ts

@@ -260,6 +260,8 @@ export function patchClass(className) {
 
   let prop;
   for (prop in instance) {
+    // https://bugs.webkit.org/show_bug.cgi?id=44721
+    if (className === 'XMLHttpRequest' && prop === 'responseBlob') continue;
     (function (prop) {
       if (typeof instance[prop] === 'function') {
         _global[className].prototype[prop] = function () {