Standalone builds failed to generate projects.

Change-Id: I2897f84242255edabd0606ad858a048f635db0bc
Reviewed-on: https://chromium-review.googlesource.com/320680Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>