Close idle H2 sockets when SpdySession is initialized.

net/spdy/spdy_session_pool.cc

Index: net/spdy/spdy_session_pool.cc
diff --git a/net/spdy/spdy_session_pool.cc b/net/spdy/spdy_session_pool.cc
index 1a594d0cb7bda48e16f9926124411e1d5e370a12..828469033d8c47c02ab281248d3fbb5f3ae3fefd 100644
--- a/net/spdy/spdy_session_pool.cc
+++ b/net/spdy/spdy_session_pool.cc
@@ -44,6 +44,7 @@ SpdySessionPool::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,
@@ -51,6 +52,7 @@ SpdySessionPool::SpdySessionPool(
     ProxyDelegate* proxy_delegate)
     : http_server_properties_(http_server_properties),
       transport_security_state_(transport_security_state),
+      http_network_session_(http_network_session),
       ssl_config_service_(ssl_config_service),
       resolver_(resolver),
       enable_sending_initial_data_(true),
@@ -95,9 +97,10 @@ base::WeakPtr<SpdySession> SpdySessionPool::CreateAvailableSessionFromSocket(
 
   auto new_session = base::MakeUnique<SpdySession>(
       key, http_server_properties_, transport_security_state_,
-      enable_sending_initial_data_, enable_ping_based_connection_checking_,
-      session_max_recv_window_size_, initial_settings_, time_func_,
-      push_delegate_, proxy_delegate_, net_log.net_log());
+      http_network_session_, enable_sending_initial_data_,
+      enable_ping_based_connection_checking_, session_max_recv_window_size_,
+      initial_settings_, time_func_, push_delegate_, proxy_delegate_,
+      net_log.net_log());
 
   new_session->InitializeWithSocket(std::move(connection), this, is_secure);