Cascades to remove serials from many objects.

BUG=angleproject:970

Change-Id: I0a74a14519da3203cd5df7ae0fa19f83393951ce
Reviewed-on: https://chromium-review.googlesource.com/286554Reviewed-by: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Tested-by: Geoff Lang <geofflang@chromium.org>