Clear cached QUIC network stats when a QUIC handshake fails.

net/http/http_server_properties.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_HTTP_HTTP_SERVER_PROPERTIES_H_
 #define NET_HTTP_HTTP_SERVER_PROPERTIES_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 275 matching lines @@
   // Returns all alternative service mappings as human readable strings.
   // Empty alternative service hostnames will be printed as such.
   virtual std::unique_ptr<base::Value> GetAlternativeServiceInfoAsValue()
       const = 0;
 
   virtual bool GetSupportsQuic(IPAddress* last_address) const = 0;
 
   virtual void SetSupportsQuic(bool used_quic,
                                const IPAddress& last_address) = 0;
 
-  // Sets |stats| for |host_port_pair|.
+  // Sets |stats| for |server|.
   virtual void SetServerNetworkStats(const url::SchemeHostPort& server,
                                      ServerNetworkStats stats) = 0;
 
+  // Clears any stats for |server|.
+  virtual void ClearServerNetworkStats(const url::SchemeHostPort& server) = 0;
+
+  // Returns any stats for |server| or nullptr if there are none.
   virtual const ServerNetworkStats* GetServerNetworkStats(
       const url::SchemeHostPort& server) = 0;
 
   virtual const ServerNetworkStatsMap& server_network_stats_map() const = 0;
 
   // Save QuicServerInfo (in std::string form) for the given |server_id|.
   // Returns true if the value has changed otherwise it returns false.
   virtual bool SetQuicServerInfo(const QuicServerId& server_id,
                                  const std::string& server_info) = 0;
 
@@ skipping 14 matching lines @@
   // Returns whether HttpServerProperties is initialized.
   virtual bool IsInitialized() const = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(HttpServerProperties);
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_SERVER_PROPERTIES_H_