To stop logging messages, like that, on Syslog:

14/12/14 10:38:24,521 WindowServer[235]: _CGXGLDisplayContextForDisplayDevice: No matching context for device (0x7fdf63610e10) – disabling OpenGL 

14/12/14 10:38:24,521 WindowServer[235]: _CGXGLDisplayContextForDisplayDevice: No matching context for device (0x7fdf63610e10) – disabling OpenGL 

14/12/14 10:38:24,561 WindowServer[235]: _CGXGLDisplayContextForDisplayDevice: No matching context for device (0x7fdf63610e10) – disabling OpenGL
14/12/14 10:38:24,573 WindowServer[235]: _CGXGLDisplayContextForDisplayDevice: No matching context for device (0x7fdf63610e10) – disabling OpenGL
14/12/14 10:38:25,243 WindowServer[235]: _CGXGLDisplayContextForDisplayDevice: No matching context for device (0x7fdf63610e10) – disabling OpenGL
14/12/14 10:38:25,274 WindowServer[235]: _CGXGLDisplayContextForDisplayDevice: No matching context for device (0x7fdf63610e10) – disabling OpenGL
14/12/14 10:38:25,293 WindowServer[235]: _CGXGLDisplayContextForDisplayDevice: No matching context for device (0x7fdf63610e10) – disabling OpenGL

Is needed to modify ASL configuration, adding, at the begining of /etc/asl.conf ,  the line:

? [CA= Message _CGXGLDisplayContextForDisplayDevice] ignore

and restarting the Syslogd

sudo killall -HUP syslogd