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..f75c3ea0f37ff2aec269d3cddd279e646258a6a1 100644
--- a/net/spdy/spdy_session.h
+++ b/net/spdy/spdy_session.h
@@ -287,14 +287,11 @@ class NET_EXPORT SpdySession : public BufferedSpdyFramerVisitorInterface,
                       const std::string& old_hostname,
                       const std::string& new_hostname);
 
-  // Create a new SpdySession.
-  // |spdy_session_key| is the host/port that this session connects to, privacy
-  // and proxy configuration settings that it's using.
-  // |session| is the HttpNetworkSession.  |net_log| is the NetLog that we log
-  // network events to.
+  // Creates a new SpdySession.
   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 +1004,8 @@ 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_;