Revert of [Chromoting] Show any startup errors in the LoadingWindow.

remoting/webapp/base/js/typecheck.js

Index: remoting/webapp/base/js/typecheck.js
diff --git a/remoting/webapp/base/js/typecheck.js b/remoting/webapp/base/js/typecheck.js
index 17b16a6f5456e85cfb9a5967f967e5c8bacf88c8..10e1959dd7b33fec2055708c5b0f5329eb0c5a03 100644
--- a/remoting/webapp/base/js/typecheck.js
+++ b/remoting/webapp/base/js/typecheck.js
@@ -19,25 +19,17 @@
 
 /**
  * @param {*} value
- * @param {boolean=} opt_allowUndefined True to accept undefined.
- * @return {boolean}
- */
-var isBoolean = function(value, opt_allowUndefined) {
-  if (opt_allowUndefined && value === 'undefined') {
-    return true;
-  }
+ * @return {boolean}
+ */
+var isBoolean = function(value) {
   return typeof value == 'boolean';
 };
 
 /**
  * @param {*} value
- * @param {boolean=} opt_allowUndefined True to accept undefined.
- * @return {boolean}
- */
-var isNumber = function(value, opt_allowUndefined) {
-  if (opt_allowUndefined && value === 'undefined') {
-    return true;
-  }
+ * @return {boolean}
+ */
+var isNumber = function(value) {
   return typeof value == 'number';
 };
 
@@ -51,13 +43,9 @@
 
 /**
  * @param {*} value
- * @param {boolean=} opt_allowUndefined True to accept undefined.
- * @return {boolean}
- */
-var isString = function(value, opt_allowUndefined) {
-  if (opt_allowUndefined && value === 'undefined') {
-    return true;
-  }
+ * @return {boolean}
+ */
+var isString = function(value) {
   return typeof value == 'string';
 };
 
@@ -258,4 +246,4 @@
   return base.assertObject(base.jsonParseSafe(jsonString));
 };
 
-})();
+})();