This reverts commit bef363bfb7.
Reason for revert: Breaks google3 tests, see b/151204525.
Original change's description:
> Fail synchronously if null is passed as an error to async APIs.
>
> The first patchset is Lasse's original changes.
>
> Change-Id: Ic5f24bcfc0ef4e82edee68d61e015b095cb5916e
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/138605
> Reviewed-by: Leaf Petersen <leafp@google.com>
TBR=leafp@google.com,rnystrom@google.com
Change-Id: Ie17c35e9d23c70a7aecd1ef292962154cf6f007d
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/138925
Reviewed-by: David Morgan <davidmorgan@google.com>
Commit-Queue: David Morgan <davidmorgan@google.com>
a5bf30c401