ValueDeserializer::ReadWasmModule does not call API functions, therefore
there can be no scheduled_exceptions, and therefore we do not have to
translate scheduled_exceptions to pending_exceptions. On the contrary,
there can be pending_exceptions, which causes the call to
RETURN_EXCEPTION_IF_SCHEDULED_EXCEPTION to crash.

This CL fixes a crash in a layout test which was caused by another
CL (https://crrev.com/c/975547).

R=mstarzinger@chromium.org
CC=​binji@chromium.org

Change-Id: I3078a2a9a532b079b5a4ea604c2f3f777fa2e287
Reviewed-on: https://chromium-review.googlesource.com/1006794Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52547}