Updated remoting.xhr API to use promises. Removed access to the native

remoting/webapp/js_proto/sinon_proto.js

Index: remoting/webapp/js_proto/sinon_proto.js
diff --git a/remoting/webapp/js_proto/sinon_proto.js b/remoting/webapp/js_proto/sinon_proto.js
index ff7eb960a70466545fa8f9820721073af9706e47..9e223dc8eecc1afa9cf852c8dce89f32402e0f4d 100644
--- a/remoting/webapp/js_proto/sinon_proto.js
+++ b/remoting/webapp/js_proto/sinon_proto.js
@@ -126,3 +126,36 @@ sinon.TestStub.prototype.onFirstCall = function() {};
 
 /** @returns {Object}  */
 sinon.createStubInstance = function (/** * */ constructor) {};
+
+/** @return {sinon.FakeXhr} */
+sinon.useFakeXMLHttpRequest = function() {};
+
+/** @interface */
+sinon.FakeXhr = function() {};
+
+/** @type {string} */
+sinon.FakeXhr.prototype.method;
+
+/** @type {string} */
+sinon.FakeXhr.prototype.url;
+
+/** @type {boolean} */
+sinon.FakeXhr.prototype.withCredentials;
+
+/** @type {?string} */
+sinon.FakeXhr.prototype.requestBody;
+
+/** @type {!Object<string,string>} */
+sinon.FakeXhr.prototype.requestHeaders;
+
+/**
+ * @param {number} status
+ * @param {!Object<string,string>} headers
+ * @param {?string} content
+ */
+sinon.FakeXhr.prototype.respond;
+
+/**
+ * @type {?function(!sinon.FakeXhr)}
+ */
+sinon.FakeXhr.prototype.onCreate;