Updated XHR API so call sites are more descriptive.

remoting/webapp/js_proto/qunit_proto.js

Index: remoting/webapp/js_proto/qunit_proto.js
diff --git a/remoting/webapp/js_proto/qunit_proto.js b/remoting/webapp/js_proto/qunit_proto.js
index f826af8c9b09d141a722fb7a887a352453fd4023..41ff67c34e31161b0369f25e87f02df2172ff3c2 100644
--- a/remoting/webapp/js_proto/qunit_proto.js
+++ b/remoting/webapp/js_proto/qunit_proto.js
@@ -26,6 +26,7 @@ QUnit.Clock.prototype.tick = function(ticks) {};
 /**
  * @param {string} desc
  * @param {Function} f
+ * @deprecated
  */
 QUnit.asyncTest = function(desc, f) {};
 
@@ -57,9 +58,9 @@ QUnit.module = function(desc, dict) {};
 /**
  * @param {*} a
  * @param {*} b
- * @param {string} desc
+ * @param {string=} opt_desc
  */
-QUnit.notEqual = function(a, b, desc) {};
+QUnit.notEqual = function(a, b, opt_desc) {};
 
 /**
  * @param {boolean} cond
@@ -72,14 +73,35 @@ QUnit.start = function() {};
 
 /**
  * @param {string} desc
- * @param {Function} f
+ * @param {function(!QUnit.Assert)} f
  */
 QUnit.test = function(desc, f) {};
 
 /** @param {Function} f */
 QUnit.testStart = function(f) {};
 
+/**
+ * @constructor
+ */
+QUnit.Assert = function() {};
+
+/**
+ * @return {function():void}
+ */
+QUnit.Assert.prototype.async  = function() {};
+
+// TODO(jrw): Make these the primary definitions.
+QUnit.Assert.prototype.deepEqual = QUnit.deepEqual;
+QUnit.Assert.prototype.equal = QUnit.equal;
+QUnit.Assert.prototype.notEqual = QUnit.notEqual;
+QUnit.Assert.prototype.ok = QUnit.ok;
+
+/**
+ * @const {!QUnit.Assert}
+ */
+QUnit.assert;
 
+// TODO(jrw): Mark these as deprecated.
 var deepEqual = QUnit.deepEqual;
 var equal = QUnit.equal;
 var expect = QUnit.expect;