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

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 479 matching lines @@
       <if expr="not is_android">
         <message name="IDS_PASSWORD_MANAGER_SAVE_PASSWORD_PROMPT" desc="Info bar message to save a password">
           Do you want Chromium to save your password?
         </message>
       </if>
       <if expr="is_android">
         <message name="IDS_PASSWORD_MANAGER_SAVE_PASSWORD_PROMPT" desc="Mobile: Info bar message to save a password">
           Do you want Chromium 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.">
+          Chromium 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 Chromium
       </message>
       <message name="IDS_MACHINE_LEVEL_INSTALL_CONFLICT" desc="Error message to display when user tries to run user level Chromium even though machine level Chromium is already installed.">
         An administrator has installed Chromium on this system, and it is available for all users. The system-level Chromium will replace your user-level installation now.
       </message>
       <message name="IDS_INSTALL_HIGHER_VERSION" desc="Error displayed when higher version already exists.">
         This computer already has a more recent version of Chromium. If the software is not working, please uninstall Chromium and try again.
       </message>
       <message name="IDS_INSTALL_HIGHER_VERSION_APP_LAUNCHER" desc="Error displayed when higher version of the Chromium App Launcher already exists.">
@@ skipping 555 matching lines @@
       <message name="IDS_PROFILE_IN_USE_LINUX" desc="Message shown when the browser cannot start because the profile is in use on a different host.">
         The profile appears to be in use by another Chromium process (<ph name="PROCESS_ID">$1<ex>12345</ex></ph>) on another computer (<ph name="HOST_NAME">$2<ex>example.com</ex></ph>). Chromium has locked the profile so that it doesn't get corrupted. If you are sure no other processes are using this profile, you can unlock the profile and relaunch Chromium.
       </message>
       <message name="IDS_PROFILE_IN_USE_LINUX_RELAUNCH" desc="Text of button in dialog to delete the profile lock file.">
         Unlock Profile and Relaunch
       </message>
 
     </messages>
   </release>
 </grit>