JBIDE-18312 CordovaSim: Fixing Cross-Domain Post requests. PR for 4.2.x

This line cause the overriding of the "Content-type" ("application / json"). I have added it some time ago to make my inAppBrowser Sample work - https://github.com/ibuziuk/google-api-oauth-phonegap. However in the general case it causes the BAD REQUEST