Update from https://crrev.com/303153

net/http/http_server_properties_manager.cc

Index: net/http/http_server_properties_manager.cc
diff --git a/net/http/http_server_properties_manager.cc b/net/http/http_server_properties_manager.cc
index 6796fb19fd8fbb36238da08a9a84f9f808e0ac97..794030d8a531ee7148257c97c99db85baf8e6850 100644
--- a/net/http/http_server_properties_manager.cc
+++ b/net/http/http_server_properties_manager.cc
@@ -746,11 +746,11 @@ void HttpServerPropertiesManager::UpdatePrefsOnPrefThread(
     }
 
     // Save alternate_protocol.
-    if (server_pref.alternate_protocol) {
+    const net::AlternateProtocolInfo* port_alternate_protocol =
+        server_pref.alternate_protocol;
+    if (port_alternate_protocol && !port_alternate_protocol->is_broken) {
       base::DictionaryValue* port_alternate_protocol_dict =
           new base::DictionaryValue;
-      const net::AlternateProtocolInfo* port_alternate_protocol =
-          server_pref.alternate_protocol;
       port_alternate_protocol_dict->SetInteger("port",
                                                port_alternate_protocol->port);
       const char* protocol_str =