Remove obsolete SHA-1 UX elements

components/pageinfo_strings.grdp

Index: components/pageinfo_strings.grdp
diff --git a/components/pageinfo_strings.grdp b/components/pageinfo_strings.grdp
index 36e825733e1429566f35ab3c49303b2f4735ac78..b1768948db233ad59f4d7364f79b0ef92ae5fb3f 100644
--- a/components/pageinfo_strings.grdp
+++ b/components/pageinfo_strings.grdp
@@ -3,11 +3,8 @@
   <message name="IDS_PAGE_INFO_HELP_CENTER_LINK" desc="This is the text of the link pointing to the Help Center. This appears at the bottom of the SSL dialog and 'this' refers to the sections within the bubble.">
     What do these mean?
   </message>
-  <message name="IDS_PAGE_INFO_SECURITY_TAB_DEPRECATED_SIGNATURE_ALGORITHM_MINOR" desc="The security summary phrase in the page information panel for a security problem where the site's certificate expires in 2016 and contains a SHA1 signature in the chain (as opposed to 2017 or later). Such certificates will not be supported in a future version of Chrome.">
-    The certificate for this site expires in 2016, and the certificate chain contains a certificate signed using SHA-1.
-  </message>
-  <message name="IDS_PAGE_INFO_SECURITY_TAB_DEPRECATED_SIGNATURE_ALGORITHM_MAJOR" desc="The security summary phrase in the page information panel for a security problem where the site's certificate expires in 2017 or later and contains a SHA1 signature in the chain (as opposed to 2016). Such certificates will not be supported in a future version of Chrome.">
-    The certificate for this site expires in 2017 or later, and the certificate chain contains a certificate signed using SHA-1.
+  <message name="IDS_PAGE_INFO_SECURITY_TAB_DEPRECATED_SIGNATURE_ALGORITHM" desc="The security summary phrase in the page information panel for a security problem where the site's certificate chain contains a SHA1 signature. Such certificates are not supported except when a policy override is present.">

[estark, 2017/01/08 16:39:58]

optional nit: "not supported" => "treated as errors"
(not sure if that's actually better or not)

[elawrence, 2017/01/09 18:13:11]

Done.

+    The certificate chain for this site contains a certificate signed using SHA-1.
   </message>
   <message name="IDS_PAGE_INFO_SECURITY_TAB_ENCRYPTED_CONNECTION_TEXT" desc="The text of the connection section when the connection is encrypted.">
     Your connection to <ph name="DOMAIN">$1<ex>www.google.com</ex></ph> is encrypted using a modern cipher suite.