SafeBrowsing support for WebSocket (post-network-servicification)

chrome/test/data/safe_browsing/malware_websocket.html

+<title>Test whether a WebSocket connection triggers a SafeBrowsing interstitial</title>
+<script>
+// Construct the WebSocket URL from the page URL. The server should not be
+// configured to accept a WebSocket handshake at this endpoint, or the "not
+// blocked" test will fail. A 404 error is perfect.
+const wsUrl = new URL('/safe_browsing/malware-ws', document.location.href);
+wsUrl.protocol = 'ws';
+const ws = new WebSocket(wsUrl.href);
+// The "not blocked" test looks for this title change to verify that the request
+// has not been blocked.
+ws.onerror = () => { document.title = 'COMPLETED'; };
+</script>