Improve error pages on client certificate failures.

components/error_page_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <grit-part>
 
   <message name="IDS_ERRORPAGE_NET_BUTTON_DETAILS" desc="Label for the button that expands the details on a net error page">
     Details
   </message>
   <message name="IDS_ERRORPAGE_NET_BUTTON_HIDE_DETAILS" desc="Label for the button that hides the details on a net error page">
     Hide details
   </message>
   <message name="IDS_ERRORPAGES_BUTTON_MORE" desc="Label for the button that expands the details on an error page">
@@ skipping 237 matching lines @@
     <ph name="HOST_NAME">&lt;strong jscontent="hostName"&gt;&lt;/strong&gt;<ex>www.whatever.com</ex></ph> uses an unsupported protocol.
   </message>
 
   <message name="IDS_ERRORPAGES_SUMMARY_PINNING_FAILURE_DETAILS" desc="Summary of the error page for a certificate which doesn't match the built-in pins for that name">
     The server certificate at <ph name="HOST_NAME">&lt;strong jscontent="hostName"&gt;&lt;/strong&gt;<ex>www.whatever.com</ex></ph> appears to be a forgery.
   </message>
   <message name="IDS_ERRORPAGES_HEADING_INSECURE_CONNECTION" desc="Heading in the error page for insecure connections.">
     This site can’t provide a secure connection
   </message>
   <message name="IDS_ERRORPAGES_SUMMARY_BAD_SSL_CLIENT_AUTH_CERT" desc="Summary in the error page for SSL client certificate authentication failure.">
-    <ph name="HOST_NAME">&lt;strong jscontent="hostName"&gt;&lt;/strong&gt;<ex>www.whatever.com</ex></ph> didn’t accept your login certificate, or your login certificate may have expired.
+    <ph name="HOST_NAME">&lt;strong jscontent="hostName"&gt;&lt;/strong&gt;<ex>www.whatever.com</ex></ph> didn’t accept your login certificate, or one may not have been provided.
   </message>
   <message name="IDS_ERRORPAGES_SUMMARY_BLOCKED_BY_EXTENSION" desc="Summary in the error page when an extension blocks a request.">
     Requests to the server have been blocked by an extension.
   </message>
   <message name="IDS_ERRORPAGES_SUMMARY_BLOCKED_BY_ADMINISTRATOR" desc="Summary in the error page when an administrator policy blocks a request.">
     The person who set up this computer has chosen to block this site.
   </message>
 
   <message name="IDS_ERRORPAGES_HTTP_POST_WARNING" desc="The error message displayed when the user navigates back or forward to a page which would resubmit post data. They can hit reload to send POST data again and load the page.">
     This webpage requires data that you entered earlier in order to be properly displayed. You can send this data again, but by doing so you will repeat any action this page previously performed.
@@ skipping 90 matching lines @@
   </if>
 
   <!-- iOS specific error page messages -->
   <if expr="is_ios">
     <message name="IDS_ERRORPAGES_SUMMARY_NOT_AVAILABLE_NO_EMPHASIS" desc="Summary in the error page when we can't connect to a site. [iOS only]">
       The webpage at <ph name="SITE">$1<ex>google.xom</ex></ph> might be temporarily down or it may have moved permanently to a new web address.
     </message>
   </if>
 
 </grit-part>