Change connection info strings (e.g. SHA-1 cert warnings) to be more clear.

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 593 matching lines @@
       </if>
       <!-- chrome://crashes strings -->
       <message name="IDS_CRASHES_DISABLED_MESSAGE" desc="The explanatory message for chrome://crashes when crash reporting is disabled">
         Crash reporting is not available in Chromium.
       </message>
       <!-- Page Info bubble -->
       <message name="IDS_PAGE_INFO_INTERNAL_PAGE" desc="Message to display in the page info bubble when the page you are on is a chrome:// page or about:something.">
         You are viewing a secure Chromium page.
       </message>
       <message name="IDS_PAGE_INFO_SECURITY_TAB_DEPRECATED_SIGNATURE_ALGORITHM" desc="The text of the identity section when the site is using a certificate that will stop working in future versions of Chrome.">
-        The site is using outdated security settings that may prevent future versions of Chromium from being able to safely access it.
+        The certificate chain for this website contains at least one certificate that was signed using an outdated algorithm (SHA-1). This website should upgrade its certificates to avoid a downgraded lock icon.

[palmer, 2015/04/30 00:30:19]

Maybe "... (SHA-1 with RSA encryption)." to be more exact? To further reduce
confusion between this and HMAC-SHA1 as the MAC in the TLS ciphersuite.

On the other hand, it's longer. But on the third hand, that makes it more
searchable. I leave it up to you. :)

[lgarron, 2015/04/30 00:58:32]

Done.

I agree that more exact and explicit is definitely better at this point (and it
doesn't make the paragraph *much* longer in this case).

       </message>
 
       <!-- Print Preview -->
       <message name="IDS_PRINT_PREVIEW_NO_PLUGIN" desc="Message to display when the PDF viewer is missing.">
         Chromium does not include the PDF viewer which is required for Print Preview to function.
       </message>
 
       <!-- Download Shelf Items -->
       <message name="IDS_DOWNLOAD_STATUS_CRX_INSTALL_RUNNING"
                desc="Message shown when a CRX has been downloaded and is being unpacked.">
@@ skipping 717 matching lines @@
           Chromium updates automatically so you always have the freshest version. When this download completes, Chromium will restart and you'll be on your way.
         </message>
         <message name="IDS_EULA_SCREEN_ACCESSIBLE_TITLE" desc="Title to be spoken on opening the OOBE EULA screen">
           Chromium OS terms
         </message>
       </if>
 
     </messages>
   </release>
 </grit>