Fix SAML single-password scrapping authenticating with an empty password

chrome/browser/resources/gaia_auth_host/authenticator.js

Index: chrome/browser/resources/gaia_auth_host/authenticator.js
diff --git a/chrome/browser/resources/gaia_auth_host/authenticator.js b/chrome/browser/resources/gaia_auth_host/authenticator.js
index 55a24f76def03b64ded67f09c3da9dd0b3ff65ca..f050b069c5333d5b13b15a32e18445a93de27661 100644
--- a/chrome/browser/resources/gaia_auth_host/authenticator.js
+++ b/chrome/browser/resources/gaia_auth_host/authenticator.js
@@ -662,7 +662,7 @@ cr.define('cr.login', function() {
       if (this.samlHandler_.scrapedPasswordCount == 1) {
         // If we scraped exactly one password, we complete the authentication
         // right away.
-        this.password = this.samlHandler_.firstScrapedPassword;
+        this.password_ = this.samlHandler_.firstScrapedPassword;

[xiyuan, 2016/06/08 15:52:01]

Oops. Missed this on review. :p

[xiyuan, 2016/06/08 15:53:16]

I wonder whether we should extend SamlTest.ScrapedSingle to verify the scraped
password. 

[afakhry, 2016/06/08 16:34:28]

Done. Please take a look.

         this.onAuthCompleted_();
         return;
       }