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 6cf1ab3e2d94f3b1360a6fa11165757c138fc090..b732de460dc71b8fd436a89fb9b541d97dd72244 100644
--- a/remoting/webapp/js_proto/sinon_proto.js
+++ b/remoting/webapp/js_proto/sinon_proto.js
@@ -91,6 +91,60 @@ sinon.Spy.prototype.getCall = function(index) {};
 
 sinon.Spy.prototype.reset = function() {};
 
+sinon.fakeServer = {};
+
+/** @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;
+
+/** @return {sinon.FakeServer} */
+sinon.fakeServer.create = function() {};
+
+/** @interface */
+sinon.FakeServer = function() {};
+
+/**
+ * @param {*} a
+ * @param {*=} opt_b
+ * @param {*=} opt_c
+ * @return {void}
+ */
+sinon.FakeServer.prototype.respondWith = function(a, opt_b, opt_c) {};
+
+/**
+ * @return {void}
+ */
+sinon.FakeServer.prototype.respond = function() {};
+
 /**
  * @param {Object} obj
  * @param {string} method