Add a new message id IDS_LOGIN_DIALOG_DESCRIPTION_NO_REALM, which...

chrome/app/generated_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!-- This file contains definitions of resources that will be translated for
 each locale. -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/generated_resources.h" type="rc_header">
       <emit emit_type='prepend'></emit>
@@ skipping 1442 matching lines @@
         Previous
       </message>
       <message name="IDS_WIZARD_CANCEL" desc="The wizard cancel button label">
         Cancel
       </message>
       <!-- Basic Auth Dialog -->
       <message name="IDS_LOGIN_DIALOG_TITLE" desc="String to be displayed in the title bar of the login prompt dialog">
         Authentication Required
       </message>
       <message name="IDS_LOGIN_DIALOG_DESCRIPTION" desc="String to be displayed in the login prompt dialog to explain what the user needs to do">
-        The server <ph name="DOMAIN">$1<ex>google.com</ex></ph> at <ph name="TITLE">$2<ex>site name</ex></ph> requires a username and password.
+        The server <ph name="DOMAIN">$1<ex>google.com</ex></ph> at <ph name="REALM">$2<ex>site name</ex></ph> requires a username and password.
+      </message>
+      <message name="IDS_LOGIN_DIALOG_DESCRIPTION_NO_REALM" desc="String to be displayed in the login prompt dialog to explain what the user needs to do">
+        The server <ph name="DOMAIN">$1<ex>google.com</ex></ph> requires a username and password.
       </message>
       <message name="IDS_LOGIN_DIALOG_USERNAME_FIELD" desc="The label of the username field in the login prompt dialog">
         User Name:
       </message>
       <message name="IDS_LOGIN_DIALOG_PASSWORD_FIELD" desc="The label of the password field in the login prompt dialog">
         Password:
       </message>
       <message name="IDS_LOGIN_DIALOG_OK_BUTTON_LABEL" desc="The label of the 'Log In' button on the login prompt dialog">
         Log In
       </message>
@@ skipping 1951 matching lines @@
         Search:
       </message>
 
       <message name="IDS_DEFAULT_FILENAME" desc="Default name for saved files when we have no idea what they could be.">
         unknown
       </message>
 
     </messages>
   </release>
 </grit>