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

chrome/app/chromium_strings.grd

Index: chrome/app/chromium_strings.grd
diff --git a/chrome/app/chromium_strings.grd b/chrome/app/chromium_strings.grd
index b304bf895c3464382f4065237b394ac3ccc227e8..abc6681e85e7bfaaa56302ae26d37865eafd47b4 100644
--- a/chrome/app/chromium_strings.grd
+++ b/chrome/app/chromium_strings.grd
@@ -757,6 +757,15 @@ Signing in anyway will merge Chromium information like bookmarks, history, and o
         </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 Chromium 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 Chromium 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.">