Remove retail mode.

chrome/app/chromeos_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <!-- ChromeOS-specific strings (included from generated_resources.grd).
      Everything in this file is wrapped in <if expr="chromeos">. -->
 <grit-part>
   <message name="IDS_EMPTY_STRING" desc="Empty string, exist only to make code generic. No translation required.">
   </message>
   <message name="IDS_CHROMEBOOK" desc="The localized name for Chromebook.">
     Chromebook
   </message>
   <message name="IDS_CHROMEBOX" desc="The localized name for Chromebox">
@@ skipping 1387 matching lines @@
   </message>
   <message name="IDS_APP_START_CONFIGURE_NETWORK" desc="Text displayed for configure network button while installing and/or launching web application in kiosk mode.">
     Configure network
   </message>
   <message name="IDS_APP_START_NETWORK_WAIT_TIMEOUT_MESSAGE" desc="Message displayed while the network wait is timed out during app launching.">
     Internet disconnected. Please check your internet connection.
   </message>
   <message name="IDS_APP_START_BAILOUT_SHORTCUT_FORMAT" desc="Message displayed at the bottom of app launch splash screen to show user the shortcut key to bailout the launch.">
   Press Ctrl + Alt + S to switch to <ph name="IDS_SHORT_PRODUCT_OS_NAME">$1<ex>Chrome OS</ex></ph>
   </message>
-  <message name="IDS_KIOSK_MODE_LOGIN_MESSAGE">
-    Click to start
-  </message>
   <message name="IDS_LOGIN_CHANGE_PHOTO">
     Change picture
   </message>
   <message name="IDS_LOGIN_PASSWORD_CHANGED_DIALOG_BOX_TITLE" desc="Title for the password changed dialog box">
     Sign in
   </message>
   <message name="IDS_LOGIN_PASSWORD_CHANGED_TITLE" desc="Title of the dialog shown when password change has been detected">
     Your password has changed
   </message>
   <message name="IDS_LOGIN_PASSWORD_CHANGED_DESC" desc="Detailed description of the password changed dialog">
@@ skipping 2414 matching lines @@
   </message>
   <message name="IDS_CHROMEOS_ACC_USERNAME_LABEL" desc="Label for the username text field.">
     Username.
   </message>
   <message name="IDS_CHROMEOS_ACC_LOGIN_SIGNING_IN" desc="Status when signing in.">
     Signing in.
   </message>
   <message name="IDS_CHROMEOS_ACC_LOGIN_SIGNIN_OFFRECORD" desc="Status when signing in incognito.">
     Entering as Guest.
   </message>
-  <message name="IDS_CHROMEOS_ACC_LOGIN_SIGNIN_DEMOUSER" desc="Status when signing in the demo user.">
-    Entering Demo.
-  </message>
   <message name="IDS_CHROMEOS_ACC_LOGIN_SIGNIN_PUBLIC_ACCOUNT" desc="Status when signing in into a public account.">
     Entering public session.
   </message>
   <message name="IDS_CHROMEOS_ACC_ACCOUNT_PICTURE" desc="Tooltip for the take account picture button.">
     Take picture.
   </message>
 
   <!-- Audio strings -->
   <message name="IDS_CHROMEOS_AUDIO_CRAS_DEVICE_AUTOMATIC" desc="Audio device name shown to the user when the proper device is automatically used.">
     Automatic
@@ skipping 2087 matching lines @@
   <message name="IDS_SET_TIME_BUTTON_CLOSE" desc="Text for the button to close the window.">
     Done
   </message>
   <message name="IDS_SET_TIME_DATE_LABEL" desc="Label for the date input element.">
     System date
   </message>
   <message name="IDS_SET_TIME_TIME_LABEL" desc="Label for the time input element.">
     System time
   </message>
 </grit-part>