WindowSurfaceGLX: Do not send an unused border_pixel to XCreateWindow This was a typo that never had any effect but it could cause problems in Debug but in release border_pixel could have contain garbage and cause an X11 error. BUG=angleproject:892 Change-Id: Id6dc24c726730d998b419101239b3a43d6675330 Reviewed-on: https://chromium-review.googlesource.com/286251 Reviewed-by: Jamie Madill <jmadill@chromium.org> Tested-by: Corentin Wallez <cwallez@chromium.org>