Update from https://crrev.com/311076

net/http/http_server_properties.cc

Index: net/http/http_server_properties.cc
diff --git a/net/http/http_server_properties.cc b/net/http/http_server_properties.cc
index 25725a8bd953e4c6ec6d3808316634af16e2a9bc..514278cc2224253a0a2a8414c517e3bdae00b1b0 100644
--- a/net/http/http_server_properties.cc
+++ b/net/http/http_server_properties.cc
@@ -7,6 +7,8 @@
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/strings/stringprintf.h"
+#include "net/socket/ssl_client_socket.h"
+#include "net/ssl/ssl_config.h"
 
 namespace net {
 
@@ -106,4 +108,10 @@ std::string AlternateProtocolInfo::ToString() const {
                             is_broken ? " (broken)" : "");
 }
 
+// static
+void HttpServerProperties::ForceHTTP11(SSLConfig* ssl_config) {
+  ssl_config->next_protos.clear();
+  ssl_config->next_protos.push_back(kProtoHTTP11);
+}
+
 }  // namespace net