Clear cached QUIC network stats when a QUIC handshake fails.

net/http/http_server_properties_impl.cc

Index: net/http/http_server_properties_impl.cc
diff --git a/net/http/http_server_properties_impl.cc b/net/http/http_server_properties_impl.cc
index c020b046d1ed64dbfd14c7625ea2e3e52358fdd9..b1b5cecbd2aeed8c306c6c39ad79dcd3456c689b 100644
--- a/net/http/http_server_properties_impl.cc
+++ b/net/http/http_server_properties_impl.cc
@@ -565,6 +565,14 @@ void HttpServerPropertiesImpl::SetServerNetworkStats(
   server_network_stats_map_.Put(server, stats);
 }
 
+void HttpServerPropertiesImpl::ClearServerNetworkStats(
+    const url::SchemeHostPort& server) {
+  ServerNetworkStatsMap::iterator it = server_network_stats_map_.Get(server);
+  if (it != server_network_stats_map_.end()) {
+    server_network_stats_map_.Erase(it);
+  }
+}
+
 const ServerNetworkStats* HttpServerPropertiesImpl::GetServerNetworkStats(
     const url::SchemeHostPort& server) {
   ServerNetworkStatsMap::iterator it = server_network_stats_map_.Get(server);