Close idle H2 sockets when SpdySession is initialized.

net/socket/client_socket_pool.h

Index: net/socket/client_socket_pool.h
diff --git a/net/socket/client_socket_pool.h b/net/socket/client_socket_pool.h
index 94c36391cbcd40da1e71826cfe24b788aca58f96..fb876a84ccd1cdf954dadc06d7a2626ad67f27a8 100644
--- a/net/socket/client_socket_pool.h
+++ b/net/socket/client_socket_pool.h
@@ -163,6 +163,9 @@ class NET_EXPORT ClientSocketPool : public LowerLayeredPool {
   // Called to close any idle connections held by the connection manager.
   virtual void CloseIdleSockets() = 0;
 
+  // Called to close any idle connections held by the connection manager.
+  virtual void CloseIdleSocketsInGroup(const std::string& group_name) = 0;
+
   // The total number of idle sockets in the pool.
   virtual int IdleSocketCount() const = 0;