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

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
===================================================================
--- chrome/app/generated_resources.grd	(revision 57510)
+++ chrome/app/generated_resources.grd	(working copy)
@@ -5378,6 +5378,9 @@
       <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.">