If force-sign-in policy is enabled, popup warning dialog before window closing if auth token becom…

chrome/app/google_chrome_strings.grd

Index: chrome/app/google_chrome_strings.grd
diff --git a/chrome/app/google_chrome_strings.grd b/chrome/app/google_chrome_strings.grd
index ed18a2a3ec224f2c5de91d8e9e883680b08bd047..77377d246797f369f4ba121faad98a948f98cf5e 100644
--- a/chrome/app/google_chrome_strings.grd
+++ b/chrome/app/google_chrome_strings.grd
@@ -761,6 +761,15 @@ Signing in anyway will merge Chrome information like bookmarks, history, and oth
         </message>
       </if>
 
+      <if expr="toolkit_views">
+        <message name="IDS_ENTERPRISE_FORCE_SIGNOUT_EXPLANATION" desc="Text of the reason to sign out">
+          Authentication certificate failed. Please sign in to Google Chrome again as <ph name="USER_NAME">$1<ex>pat@example.com</ex></ph> or contact your administrator for more information. <ph name="ADDITIONAL_EXPLANATION">$2</ph>
+        </message>
+        <message name="IDS_ENTERPRISE_FORCE_SIGNOUT_EXPLANATION_WITHOUT_USER_NAME" desc="Text of the reason to sign out when there is no valid email address">
+          Authentication certificate failed. Please sign in to Google Chrome again or contact your administrator for more information. <ph name="ADDITIONAL_EXPLANATION">$2</ph>
+      </message>
+      </if>
+
       <!-- Signin Email Confirmation tab modal dialog -->
       <if expr="not chromeos">
         <message name="IDS_SIGNIN_EMAIL_CONFIRMATION_TITLE" desc="Title of the signin email confirmation tab modal dialog.">