Close idle H2 sockets when SpdySession is initialized.

net/socket/mock_client_socket_pool_manager.cc

Index: net/socket/mock_client_socket_pool_manager.cc
diff --git a/net/socket/mock_client_socket_pool_manager.cc b/net/socket/mock_client_socket_pool_manager.cc
index 3c80ac64bb7865abc547f0328a3849ba7398a77b..cbe1f275f2f93f5c860e426d3d3cc0e33a09b5cb 100644
--- a/net/socket/mock_client_socket_pool_manager.cc
+++ b/net/socket/mock_client_socket_pool_manager.cc
@@ -51,6 +51,11 @@ void MockClientSocketPoolManager::CloseIdleSockets() {
   NOTIMPLEMENTED();
 }
 
+void MockClientSocketPoolManager::CloseIdleSocketsInGroup(
+    const std::string& group_name) {
+  NOTIMPLEMENTED();
+}
+
 TransportClientSocketPool*
 MockClientSocketPoolManager::GetTransportSocketPool() {
   return transport_socket_pool_.get();