Implement the inline signin confirmation bubble and mirror upgrade tutorial

chrome/app/chromium_strings.grd

 <?xml version="1.0" encoding="UTF-8"?>
 <!-- This file contains definitions of strings that are distribution specific.
 These strings will not be translated and only english versions will
 be available for now. -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/chromium_strings.h" type="rc_header">
       <emit emit_type='prepend'></emit>
@@ skipping 817 matching lines @@
           Chromium Helper
         </message>
       </if>
 
       <!-- Chrome sign-in page -->
       <message name="IDS_CHROME_SIGNIN_TITLE" desc="Title on the about:chrome-signin page">
         Chromium
       </message>
 
       <!-- Tutorial card in the avatar menu bubble -->
-      <message name="IDS_PROFILES_PREVIEW_ENABLED_TUTORIAL_CONTENT_TEXT" desc="The main content of the tutorial card in the avatar menu bubble view shown when user enables the new profile management preview.">
-        You can add your other Google Accounts and lock your Chromium below.
+      <message name="IDS_PROFILES_CONFIRM_SIGNIN_TUTORIAL_TITLE" desc="The title of the tutorial card in the avatar menu bubble view shown when a user signs in to Chromium.">
+        You're now signed in to Chromium
       </message>
-      <message name="IDS_PROFILES_PREVIEW_TUTORIAL_TITLE" desc="The title of the tutorial card in the avatar menu bubble view that asks the user to preview the new profile management UI.">
-        Preview the new Chromium
-      </message>
-      <message name="IDS_PROFILES_PREVIEW_TUTORIAL_CONTENT_TEXT" desc="The main content of the tutorial card in the avatar menu bubble view that asks the user to preview the new profile management UI.">
-       Try the new way to use Chromium with your Google Account and on shared computers.
-      </message>
-      <message name="IDS_PROFILES_FEEDBACK_TUTORIAL_CONTENT_TEXT" desc="The main content of the tutorial card in the avatar menu bubble view that asks the user to send feedback about the new profile management UI.">
-       You're previewing the new Chromium.
+      <message name="IDS_PROFILES_WELCOME_UPGRADE_TUTORIAL_CONTENT_TEXT" desc="The main content of the tutorial card in the avatar menu bubble view that introduces an upgrade user to the new profile management UI.">
+       Share a computer? Now you can set up Chromium just the way you like it.
       </message>
 
       <!-- Account removal view in the avatar menu bubble -->
       <message name="IDS_PROFILES_ACCOUNT_REMOVAL_TEXT" desc="Main text of the account removal view when removing a secondary account.">
         After removing your account from Chromium, you may need to reload your open tabs to take effect.
       </message>
       <message name="IDS_PROFILES_PRIMARY_ACCOUNT_REMOVAL_TEXT" desc="Main text of the account removal view when removing a primary account.">
         You're using <ph name="PROFILE_EMAIL">$1<ex>jessica@gmail.com</ex></ph> to sync your Chromium stuff. To update your sync preference or to use Chromium without a Google account, visit <ph name="SETTINGS_LINK">$2<ex>settings</ex></ph>.
       </message>
 
@@ skipping 420 matching lines @@
           Chromium updates automatically so you always have the freshest version. When this download completes, Chromium will restart and you'll be on your way.
         </message>
         <message name="IDS_EULA_SCREEN_ACCESSIBLE_TITLE" desc="Title to be spoken on opening the OOBE EULA screen">
           Chromium OS terms
         </message>
       </if>
 
     </messages>
   </release>
 </grit>