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chromium/third_party/blink/web_tests/external/wpt/html/webappapis/system-state-and-capabilities/the-navigator-object/secure_context.html 

<!DOCTYPE HTML>
<html>
<head>
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
  <script>
    test(t => {
      assert_false('registerProtocolHandler' in navigator);
      assert_equals(navigator.registerProtocolHandler, undefined);
    }, "navigator.registerProtocolHandler does not exist in non-secure contexts.");

    test(t => {
      assert_false('unregisterProtocolHandler' in navigator);
      assert_equals(navigator.unregisterProtocolHandler, undefined);
    }, "navigator.unregisterProtocolHandler does not exist in non-secure contexts.");
  </script>
</head>
</html>