Add string for password protected PDFs.

chrome/app/generated_resources.grd

 <?xml version="1.0" encoding="UTF-8"?>
 
 <!-- This file contains definitions of resources that will be translated for
 each locale. -->
 
 <grit base_dir="." latest_public_release="0" current_release="1"
       source_lang_id="en" enc_check="möl">
   <outputs>
     <output filename="grit/generated_resources.h" type="rc_header">
       <emit emit_type='prepend'></emit>
@@ skipping 8764 matching lines @@
       <message name="IDS_ABOUT_SANDBOX_SECCOMP_SANDBOX" desc="The name of a type of sandbox used by Chrome on UNIX like systems. 'Seccomp' is a technical term which should be left untranslated.">
         Seccomp sandbox
       </message>
       <message name="IDS_ABOUT_SANDBOX_OK" desc="A message telling the user that their sandbox is sufficient.">
         You are adequately sandboxed.
       </message>
       <message name="IDS_ABOUT_SANDBOX_BAD" desc="A message telling the user that their sandbox is insufficient.">
         You are not adequately sandboxed!
       </message>
     </if>
+    
+    <message name="IDS_PDF_NEED_PASSWORD" desc="A message asking the user for a password to open a PDF file.">
+      This document is password protected.  Please enter a password.
+    </message>
 
     </messages>
 
     <structures fallback_to_english="true">
       <structure name="IDD_CHROME_FRAME_FIND_DIALOG" file="cf_resources.rc" type="dialog" >
       </structure>
     </structures>
 
   </release>
 </grit>