[Mac] Add option to reauthenticate the OS user before revealing passwords.

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 138215fd5fb36bee002f8da908f04220bb25844e..2cf23681ad03b52f71d2264d09b32197caccbf08 100644
--- a/chrome/app/google_chrome_strings.grd
+++ b/chrome/app/google_chrome_strings.grd
@@ -420,6 +420,11 @@ Google Chrome is unable to recover your settings.
           Do you want Google Chrome to save your password for this site?
         </message>
       </if>
+      <if expr="is_macosx">
+        <message name="IDS_PASSWORDS_PAGE_AUTHENTICATION_PROMPT" desc="Text for the dialog box that prompts the user for their OS account password before revealing plaintext passwords on the password page.">
+          Google Chrome is trying to show passwords.
+        </message>
+      </if>
       <message name="IDS_CANT_WRITE_USER_DIRECTORY_EXIT_BUTTON" desc="Text on button of dialog that closes Chrome if we can't create a directory for this user.">
         Exit Chrome
       </message>