Allow explicitly whitelisted apps/extensions in public sessions

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 8a7d689ed1101fe8cdce8bcd7ca969b103d9c82d..972acd93c2d102354fc36151c9c80b0ffa395592 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -4403,6 +4403,9 @@ Make sure you do not expose any sensitive information.
       <message name="IDS_EXTENSION_CANT_INSTALL_POLICY_BLOCKED" desc="Error message when a user tries to install an extension that is blocked by administrator policy.">
         <ph name="EXTENSION_NAME">$1<ex>Google Talk</ex></ph> (extension ID "<ph name="EXTENSION_ID">$2<ex>nckgahadagoaajjgafhacjanaoiihapd</ex></ph>") is blocked by the administrator.
       </message>
+      <message name="IDS_EXTENSION_CANT_INSTALL_IN_DEVICE_LOCAL_ACCOUNT" desc="Error message when a user tries to install or the administrator tries to force-install through policy an extension that is not allowed in a device-local account.">
+        <ph name="EXTENSION_NAME">$1<ex>Google Talk</ex></ph> (extension ID "<ph name="EXTENSION_ID">$2<ex>nckgahadagoaajjgafhacjanaoiihapd</ex></ph>") is not allowed in this type of session.
+      </message>
       <message name="IDS_EXTENSION_CANT_MODIFY_POLICY_REQUIRED" desc="Error message when a user tries to remove or change an extension that is required by administrator policy.">
         The administrator of this machine requires <ph name="EXTENSION_NAME">$1<ex>Google Talk</ex></ph> to be installed. It cannot be removed or modified.
       </message>