The API for serialized modules changed a bit in version 7.3. The old
API is deprecated, hence remove it in 7.4.

R=mstarzinger@chromium.org, ulan@chromium.org

Bug: chromium:912031

Change-Id: Ib1a55dc88db9e98aef03006caf8cdc1be4f85b9f
Reviewed-on: https://chromium-review.googlesource.com/c/1436020Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59122}