[Webapp Refactor] Group authentications fields into remoting.CredentialsProvider.

remoting/webapp/crd/js/identity.js

Index: remoting/webapp/crd/js/identity.js
diff --git a/remoting/webapp/crd/js/identity.js b/remoting/webapp/crd/js/identity.js
index 28258168aad4a887bdd3ed35123cd7d54c4ac2b2..f17e9354f6a717d997489b25c769dbad709f9701 100644
--- a/remoting/webapp/crd/js/identity.js
+++ b/remoting/webapp/crd/js/identity.js
@@ -157,7 +157,7 @@ remoting.Identity.prototype.getUserInfo = function() {
  *     address or rejected with a remoting.Error.
  */
 remoting.Identity.prototype.getEmail = function() {
-  this.getUserInfo().then(function(userInfo) {
+  return this.getUserInfo().then(function(userInfo) {
     return userInfo.email;
   });
 };