Implement Web Restrictions in WebView.

components/supervised_user_error_page/resources/supervised_user_block_interstitial.js

Index: components/supervised_user_error_page/resources/supervised_user_block_interstitial.js
diff --git a/components/supervised_user_error_page/resources/supervised_user_block_interstitial.js b/components/supervised_user_error_page/resources/supervised_user_block_interstitial.js
index ca0bbec39b1d338a5bcf2b066d095658be9afc5a..3374af9235b99068aa01a79b502232d53139d24d 100644
--- a/components/supervised_user_error_page/resources/supervised_user_block_interstitial.js
+++ b/components/supervised_user_error_page/resources/supervised_user_block_interstitial.js
@@ -15,7 +15,11 @@ function initialize() {
   if (loadTimeData.getBoolean('allowAccessRequests')) {
     $('request-access-button').onclick = function(event) {
       $('request-access-button').hidden = true;
-      sendCommand('request');
+      if (window.domAutomationController) {
+        sendCommand('request');
+      } else {
+        window.webRestrictions.requestPermission();
+      }
     };
   } else {
     $('request-access-button').hidden = true;
@@ -49,9 +53,11 @@ function initialize() {
   var showDetailsLink = loadTimeData.getString('showDetailsLink');
   $('show-details-link').hidden = !showDetailsLink;
   $('back-button').hidden = showDetailsLink;
-  $('back-button').onclick = function(event) {
-    sendCommand('back');
-  };
+  if (window.domAutomationController) {
+      $('back-button').onclick = function(event) {
+        sendCommand('back');
+      };
+  }
   $('show-details-link').onclick = function(event) {
     $('details').hidden = false;
     $('show-details-link').hidden = true;
@@ -66,7 +72,8 @@ function initialize() {
     $('information-container').classList.remove('hidden-on-mobile');
     $('request-access-button').classList.remove('hidden-on-mobile');
   };
-  if (loadTimeData.getBoolean('showFeedbackLink')) {
+  if (window.domAutomationController &&
+        loadTimeData.getBoolean('showFeedbackLink')) {
     $('feedback-link').onclick = function(event) {
       sendCommand('feedback');
     };