fix #577, canPatchViaPropertyDescriptor test should add configurable to XMLHttpRequest.prototype (#578)
fix #577, canPatchViaPropertyDescriptor test should add configurable to XMLHttpRequest.prototype (#578)


angular/zone.js,angular/zone.js,mhevery/zone.js,mhevery/zone.js,mhevery/zone.js,angular/zone.js,mhevery/zone.js,angular/zone.js,angular/zone.js