Remove __stdcall from non-windows builds. Change-Id: I424cb538808ec64137c85af3bbe8742043e1c573 Reviewed-on: https://chromium-review.googlesource.com/183260 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Shannon Woods <shannonwoods@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>