Make sure the old resources are deleted but do not create new resources.

BUG=angleproject:2161

Change-Id: Ia6685e5c67b160d9bcd503983aee9607b2bd402c
Reviewed-on: https://chromium-review.googlesource.com/891644
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>