This reverts commit 1a3a2bc3.

Reason for revert: Only CL in a reverted roll (https://chromium-review.googlesource.com/c/chromium/src/+/1477147)

Original change's description:
> Fix accessor update of non-extensible maps.
> 
> When installing getter/setter of non-extensible map with existing
> setter/getter of the same name, we introduce a new transition
> (so we have two transitions with the same name!). This triggers
> an assertion in map updater.
> 
> This fix carefully checks that on the back-pointer path from
> non-extensible map to the extensible map there are only
> integrity level transitions. Otherwise, we just bail out.
> 
> Bug: chromium:932953
> Change-Id: I02e91c3b652428a84a9f5c58b6691ea9b1fc44d6
> Reviewed-on: https://chromium-review.googlesource.com/c/1477067
> Reviewed-by: Igor Sheludko <ishell@chromium.org>
> Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#59667}

TBR=jarin@chromium.org,ishell@chromium.org

Change-Id: I9264423c605cebef87beb6c0f066e90b59faae48
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:932953
Reviewed-on: https://chromium-review.googlesource.com/c/1477219Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59680}