Unfork IDS_PAGE_INFO_NON_SECURE_TRANSPORT into IDS_PAGEINFO_NOT_SECURE_SUMMARY

components/page_info_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <grit-part>
   <!-- Security summary strings -->
   <!-- TODO(crbug.com/716305): Rename remaining IDS_PAGE_INFO_* strings to IDS_PAGE_INFO_* -->
   <message name="IDS_PAGE_INFO_SECURE_SUMMARY" desc="A short summary phrase at the top of the Page Info bubble (which shows when you click the lock icon) that indicates that the connection to the current website is secure.">
     Secure connection
   </message>
   <message name="IDS_PAGE_INFO_MIXED_CONTENT_SUMMARY" desc="A one-line summary at the top of the Page Info bubble (which shows when you click the security indicator) if the connection to the current website is using mainly using a secure connection but has some insecure parts (like insecurely loaded images).">
     Your connection to this site is not fully secure
   </message>
@@ skipping 294 matching lines @@
       </message>
     </if>
 
     <!-- WebVR -->
     <message name="IDS_PAGE_INFO_INSECURE_WEBVR_CONTENT_TRANSIENT" desc="Text that is displayed temporarily as a large toast on first entering a WebVR page over non-secure transport.">
       Your connection to this site is not private. To exit VR mode at any time, remove headset and press back.
     </message>
     <message name="IDS_PAGE_INFO_INSECURE_WEBVR_CONTENT_PERMANENT" desc="Text that is displayed in a small permanent notification on a WebVR page loaded over non-secure transport. (Should be short, does not need to be a complete sentence.)">
       Not secure
     </message>
-
-    <!-- TODO(crbug.com/704788): Replace with IDS_PAGE_INFO_NOT_SECURE_SUMMARY -->
-    <message name="IDS_PAGE_INFO_NON_SECURE_TRANSPORT" desc="Text that is displayed in the header of the Website Settings popup if the website uses non-secure transport.">
-      Your connection to this site is not private.
-    </message>
   </if>
 </grit-part>