This reverts commit 4b1fd35b.

Reason for revert: Breaks a lot of tests on native Android:
https://ci.chromium.org/p/v8/builders/ci/V8%20Android%20Arm64%20-%20N5X/7863

Original change's description:
> [heap] Enable usage of ArrayBufferExtensions
> 
> Switch the flag to true to enable ArrayBufferExtensions by default.
> 
> Bug: v8:10064
> Change-Id: I9b772fbd36372e3454ac66a476d33cba121b45c9
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2064208
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#66339}

TBR=ulan@chromium.org,dinfuehr@chromium.org

Change-Id: I00f6c1b2f58bc937a1521045b4853e88300204d9
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:10064
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2065088Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66355}