[DEPS] Use Var instead of {} in DEPS New presubmit checks in DEPS need to efficiently parse DEPS file in order to detect drifts between DEPS and Git submodules. Bug: chromium:1476115 Change-Id: Ie62762a88073a098068fc76690ea9c95be98de73 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4827482 Auto-Submit: Josip Sokcevic <sokcevic@chromium.org> Commit-Queue: Josip Sokcevic <sokcevic@chromium.org> Reviewed-by: Yuly Novikov <ynovikov@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Yuly Novikov <ynovikov@chromium.org> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>