Fix "unused private variable" warning in ParseContext BUG=angleproject:892 Change-Id: I3d0c23f1c2d43477c8b4ff28a6db470b3491de0b Reviewed-on: https://chromium-review.googlesource.com/271276 Reviewed-by: Jamie Madill <jmadill@chromium.org> Tested-by: Corentin Wallez <cwallez@chromium.org>