Update supervised user interstitial pages.

components/supervised_user_error_page_strings.grdp

 <?xml version="1.0" encoding="utf-8"?>
 <grit-part>
       <!-- Supervised User Block Interstitial data -->
       <message name="IDS_BLOCK_INTERSTITIAL_TITLE" desc="A title for the supervised-user block interstitial page.">
         Site blocked
       </message>
       <message name="IDS_BLOCK_INTERSTITIAL_HEADER" desc="A heading for the supervised user when they attempt to visit a site that is not permitted by the manager.">
         You need permission from <ph name="NAME">$1<ex>John Doe</ex></ph> to visit this site
       </message>
       <message name="IDS_CHILD_BLOCK_INTERSTITIAL_HEADER" desc="A heading for the message to the child user when they attempt to visit a site that is not permitted by their parent.">
@@ skipping 26 matching lines @@
       <message name="IDS_CHILD_BLOCK_INTERSTITIAL_REQUEST_SENT_MESSAGE_MULTI_PARENT" desc="The text that tells the child user that a request has been sent to their parents.">
         You asked your parents if it's OK to visit this site
       </message>
       <message name="IDS_CHILD_BLOCK_INTERSTITIAL_REQUEST_FAILED_MESSAGE_SINGLE_PARENT" desc="The text that tells the child user that a request to their parent failed.">
         We could not reach your parent at the moment. Please try again.
       </message>
       <message name="IDS_CHILD_BLOCK_INTERSTITIAL_REQUEST_FAILED_MESSAGE_MULTI_PARENT" desc="The text that tells the child user that a request to their parents failed.">
         We could not reach your parents at the moment. Please try again.
       </message>
       <message name="IDS_BLOCK_INTERSTITIAL_SEND_FEEDBACK" desc="The text for a link to submit feedback about a blocked site.">
-        Was this unexpected? <ph name="BEGIN_LINK">&lt;a is="action-link" id="feedback-link"&gt;</ph>Let us know<ph name="END_LINK">&lt;/a&gt;</ph>
+        Was this unexpected? <ph name="BEGIN_LINK">&lt;a href="#" id="feedback-link"&gt;</ph>Let us know<ph name="END_LINK">&lt;/a&gt;</ph>
       </message>
       <message name="IDS_BLOCK_INTERSTITIAL_SHOW_DETAILS" desc="The text for the link to show details about the interstitial.">
         Details
       </message>
       <message name="IDS_BLOCK_INTERSTITIAL_HIDE_DETAILS" desc="The text for the link to hide details about the interstitial.">
         Hide details
       </message>
       <message name="IDS_SUPERVISED_USER_BLOCK_HEADER" desc="Header for the message to be shown when a site was blocked.">
         This site is blocked
       </message>
@@ skipping 16 matching lines @@
         Your parents can unblock it for you
       </message>
       <message name="IDS_SUPERVISED_USER_BLOCK_MESSAGE_MANUAL" desc="Message to be shown to a supervised user when a site is blocked due to a manual blacklist entry">
         Your manager can unblock it for you
       </message>
       <message name="IDS_SUPERVISED_USER_NOT_SIGNED_IN" desc="Message to be shown to a supervised user who is not signed in to Chrome">
         Please start and sign in to Chrome so that Chrome can check whether you are allowed to access this site.
       </message>
 
 </grit-part>