Originally, the NativeModule and the WasmModuleObject were created
together, and the streaming decoder was notified after the
WasmModuleObject was created. A recent CL (https://crrev.com/c/1402544),
however, changed that.  The NativeModule gets created before compilation
starts, the WasmModuleObject, however, gets created after compilation.

The streaming decoder only needs the NativeModule to register a callback
before compilation. Therefore this CL we change the notification of the
streaming decoder to receive only the NativeModule, not the
WasmModuleObject, before starting compilation.

R=clemensh@chromium.org
CC=bbudge@chromium.org

Bug: chromium:719172
Change-Id: I4ad879e4ebd2d88174d7e2a0c6359f2836926763
Reviewed-on: https://chromium-review.googlesource.com/c/1404442
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58703}