This fixes project generation for Chromium for non-X11 builds

BUG=angleproject:1011

Change-Id: If528f63fb186d834d56a43ca379497d99e74777e
Reviewed-on: https://chromium-review.googlesource.com/273163Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>