Close idle H2 sockets when SpdySession is initialized.

net/socket/transport_client_socket_pool.cc

Index: net/socket/transport_client_socket_pool.cc
diff --git a/net/socket/transport_client_socket_pool.cc b/net/socket/transport_client_socket_pool.cc
index 3cbbd611732fd9d6d0d91a9db28d5f9d0345237e..1f5ca0e88bf2edfd3f849307b96539c2405c3861 100644
--- a/net/socket/transport_client_socket_pool.cc
+++ b/net/socket/transport_client_socket_pool.cc
@@ -564,6 +564,11 @@ void TransportClientSocketPool::CloseIdleSockets() {
   base_.CloseIdleSockets();
 }
 
+void TransportClientSocketPool::CloseIdleSocketsInGroup(
+    const std::string& group_name) {
+  base_.CloseIdleSocketsInGroup(group_name);
+}
+
 int TransportClientSocketPool::IdleSocketCount() const {
   return base_.idle_socket_count();
 }