Persist the alternate protocol as a string not an int to allow the enum to be changed without affec…

net/http/http_server_properties.h

Index: net/http/http_server_properties.h
diff --git a/net/http/http_server_properties.h b/net/http/http_server_properties.h
index e61be5eb4abaac9e54879eca0cb033b9dcadcd47..50f95eb9d21c87ae63b0182ca1f8d3005bdd55b8 100644
--- a/net/http/http_server_properties.h
+++ b/net/http/http_server_properties.h
@@ -25,6 +25,9 @@ enum AlternateProtocol {
   UNINITIALIZED_ALTERNATE_PROTOCOL,
 };
 
+const char* AlternateProtocolToString(AlternateProtocol protocol);
+AlternateProtocol AlternateProtocolFromString(const std::string& protocol);
+
 struct NET_EXPORT PortAlternateProtocolPair {
   bool Equals(const PortAlternateProtocolPair& other) const {
     return port == other.port && protocol == other.protocol;