Make the event pump loop in the renderer process we do on Windows exit when the Framebuffer's subwindow is destroyed. Fixed TcpStream to close the socket using 'closesocket' on windows, otherwise the other end of the socket does not sense that the socket is closed. + Use WS_DISABLED to ensure that our GL subwindow doesn't receive any input events. Change-Id: Icb477b3e1d7993a8880acb5e01bc5da29309ae50