Add mixed content warning to the Page Info bubble....

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 5360 matching lines @@
       </message>
       <message name="IDS_PAGE_INFO_SECURITY_TAB_COMPRESSION_DETAILS" desc="This message contains the compression algorithm in use on an SSL connection">
         The connection is compressed with <ph name="COMPRESSION">$1<ex>DEFLATE</ex></ph>.
       </message>
       <message name="IDS_PAGE_INFO_SECURITY_TAB_FALLBACK_MESSAGE" desc="This message is displayed when the first secure connection to a site failed and Chrome retried with an older protocol.">
         The connection had to be retried using SSL 3.0. This typically means that the server is using very old software and may have other security issues.
       </message>
       <message name="IDS_PAGE_INFO_SECURITY_TAB_RENEGOTIATION_MESSAGE" desc="This message is displayed when the server hasn't been updated to fix a recent security issues. TLS here is an acronym and need not be translated. 'renegotiation' is a technical term describing a process of agreeing on a new set of security parameters and secrets. 'extension' here should be taken to mean 'amendment' rather than elongation.">
         The server does not support the TLS renegotiation extension.
       </message>
+      <message name="IDS_PAGE_INFO_SECURITY_MIXED_CONTENT" desc="This message is displayed when there is mixed HTTP and HTTPS content on the page.">
+        Some of the elements on this page came from an unverified source and were not displayed.
+      </message>
 
       <!-- SSL Blocking Page -->
       <message name="IDS_SSL_BLOCKING_PAGE_TITLE" desc="The title of the SSL blocking page.">
         SSL Error
       </message>
       <message name="IDS_SSL_BLOCKING_PAGE_PROCEED" desc="Proceed button text of the SSL blocking page.">
         Proceed anyway
       </message>
       <message name="IDS_SSL_BLOCKING_PAGE_EXIT" desc="'Back' button text of the SSL blocking page.">
         Back to safety
@@ skipping 4010 matching lines @@
 
     </messages>
 
     <structures fallback_to_english="true">
       <structure name="IDD_CHROME_FRAME_FIND_DIALOG" file="cf_resources.rc" type="dialog" >
       </structure>
     </structures>
 
   </release>
 </grit>