Use `scripts/standalone.gclient` instead.
Bug: dawn:1339
Change-Id: Id702d42d104a0f6951973792389f897a6bdf4b10
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/86069
Reviewed-by: Ryan Harrison <rharrison@chromium.org>
Commit-Queue: Ben Clayton <bclayton@google.com>