This reverts commit 5c309271.

Reason for revert: Broke fast/workers/worker-shared-asm-buffer.html

Original change's description:
> Reland "[asmjs] Properly validate asm.js heap sizes"
>
> This is a reland of 5d69010e
>
> Original change's description:
> > [asmjs] Properly validate asm.js heap sizes
> >
> > Enforce both engine limitations and spec (http://asmjs.org/spec/latest/)
> > limitations on the size of asm.js heaps.
> >
> > R=clemensh@chromium.org
> > CC=​mstarzinger@chromium.org
> >
> > Bug: chromium:873600
> > Change-Id: I104c23bbd0a9a7c494f97f8f9e83ac5a37496dfd
> > Reviewed-on: https://chromium-review.googlesource.com/1174411
> > Commit-Queue: Ben Titzer <titzer@chromium.org>
> > Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#55163}
>
> Bug: chromium:873600
> Change-Id: Id24070bda3aafb9e1a32af0732a1b18f633ef932
> Reviewed-on: https://chromium-review.googlesource.com/1179681
> Commit-Queue: Ben Titzer <titzer@chromium.org>
> Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#55193}

TBR=mstarzinger@chromium.org,titzer@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: chromium:873600
Change-Id: I5845c584c7ac399b9b7939f5fd50c09b7b2cc3d2
Reviewed-on: https://chromium-review.googlesource.com/1182616
Commit-Queue: Aseem Garg <aseemgarg@chromium.org>
Reviewed-by: Aseem Garg <aseemgarg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55242}