Eliminated named constants for instances of remoting.Error.

remoting/webapp/crd/js/xhr.js

Index: remoting/webapp/crd/js/xhr.js
diff --git a/remoting/webapp/crd/js/xhr.js b/remoting/webapp/crd/js/xhr.js
index 0551bdca3be439f0e620eddae9d9a05144d6f200..0529838ddfa88730b521a4e5d457d3546d98ca5c 100644
--- a/remoting/webapp/crd/js/xhr.js
+++ b/remoting/webapp/crd/js/xhr.js
@@ -208,12 +208,12 @@ remoting.xhr.defaultResponse = function(onDone, onError, opt_ignoreErrors) {
   var result = function(xhr) {
     var error =
         remoting.Error.fromHttpStatus(/** @type {number} */ (xhr.status));
-    if (!error.isError()) {
+    if (error.isNone()) {
       onDone();
       return;
     }
 
-    if (opt_ignoreErrors && opt_ignoreErrors.indexOf(error.tag) !== -1) {
+    if (opt_ignoreErrors && error.hasTag.apply(error, opt_ignoreErrors)) {
       onDone();
       return;
     }