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This is the blink side CL to refactor WebAssembly.instantiateStreaming
to make it spec compliant again. The design doc where the whole change
is discussed is available in the tracking bug. The tracking bug also
references prototype implementations of the whole change, which includes
the changes in this CL.

Note that most of the changes in this CL are copied from the existing
implementation which uses the old API.

I added a regression test but disable it until the V8 change landed.

Bug: chromium:860637

Change-Id: Iba75dc4e187aad5891084e5e7dcc3f759e86f706
Reviewed-on: https://chromium-review.googlesource.com/1081947
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577586}