Close idle H2 sockets when SpdySession is initialized.

net/spdy/spdy_session.h

Index: net/spdy/spdy_session.h
diff --git a/net/spdy/spdy_session.h b/net/spdy/spdy_session.h
index 30150e2310cc3debca09b8c789dda2cc8cc9e668..d832ac6fe075bbf560c03ebc794428b67d4057a0 100644
--- a/net/spdy/spdy_session.h
+++ b/net/spdy/spdy_session.h
@@ -290,11 +290,12 @@ class NET_EXPORT SpdySession : public BufferedSpdyFramerVisitorInterface,
   // Create a new SpdySession.
   // |spdy_session_key| is the host/port that this session connects to, privacy

[Bence, 2017/02/08 00:18:52]

Optional: remove lines 291--294, because they really do not add any value.

[xunjieli, 2017/02/08 14:15:40]

Done.

   // and proxy configuration settings that it's using.
-  // |session| is the HttpNetworkSession.  |net_log| is the NetLog that we log
-  // network events to.
+  // |http_network_session| is the HttpNetworkSession.  |net_log| is the NetLog
+  // that we log network events to.
   SpdySession(const SpdySessionKey& spdy_session_key,
               HttpServerProperties* http_server_properties,
               TransportSecurityState* transport_security_state,
+              HttpNetworkSession* http_network_session,
               bool enable_sending_initial_data,
               bool enable_ping_based_connection_checking,
               size_t session_max_recv_window_size,
@@ -1007,6 +1008,8 @@ class NET_EXPORT SpdySession : public BufferedSpdyFramerVisitorInterface,
 
   TransportSecurityState* transport_security_state_;
 
+  HttpNetworkSession* http_network_session_;
+
   // The socket handle for this session.
   std::unique_ptr<ClientSocketHandle> connection_;