This reverts commit b67f45f955.
Reason for revert: This seems to cause a crash on ARMv7 aot compiled code.
Original change's description:
> [VM/Runtime] Fix 'File' object leak in async file open operation
>
> The 'File' object created in the async file open method is leaked
> if the operation is not completed when the isolate shuts down
> with an unhandled exception.
> This change adds a finalizable state for the 'File' object so that
> the message deletion that happens when ports are closed could run
> the callback to clean up the 'File' object.
>
> TEST=new tests added
>
> Change-Id: I4a3cb28370d27306c795c1914aeb5c18a1d85e2b
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/210761
> Reviewed-by: Alexander Aprelev <aam@google.com>
> Commit-Queue: Siva Annamalai <asiva@google.com>
TBR=aam@google.com,rmacnak@google.com,asiva@google.com
Change-Id: Ie91aadd318ef19a0bb4d7f769c9e876e76d719d8
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/211021
Reviewed-by: William Hesse <whesse@google.com>
Commit-Queue: William Hesse <whesse@google.com>
637e14006c