Close idle H2 sockets when SpdySession is initialized.

net/spdy/spdy_session_pool.h

Index: net/spdy/spdy_session_pool.h
diff --git a/net/spdy/spdy_session_pool.h b/net/spdy/spdy_session_pool.h
index 661501f1aba6d1a8e11fd56e08166590a7c91470..1205093afe7ea7a50ba05730e098b90612778a47 100644
--- a/net/spdy/spdy_session_pool.h
+++ b/net/spdy/spdy_session_pool.h
@@ -40,6 +40,7 @@ namespace net {
 class ClientSocketHandle;
 class HostResolver;
 class HttpServerProperties;
+class HttpNetworkSession;
 class NetLogWithSource;
 class ProxyDelegate;
 class SpdySession;
@@ -57,6 +58,7 @@ class NET_EXPORT SpdySessionPool
                   SSLConfigService* ssl_config_service,
                   HttpServerProperties* http_server_properties,
                   TransportSecurityState* transport_security_state,
+                  HttpNetworkSession* http_network_session,
                   bool enable_ping_based_connection_checking,
                   size_t session_max_recv_window_size,
                   const SettingsMap& initial_settings,
@@ -204,6 +206,8 @@ class NET_EXPORT SpdySessionPool
 
   TransportSecurityState* transport_security_state_;
 
+  HttpNetworkSession* http_network_session_;
+
   // The set of all sessions. This is a superset of the sessions in
   // |available_sessions_|.
   //