3d53df52af
See b/157883819: Custom embedder doesn't correctly join threads that
interacted with Dart API, which causes us to hit the newly added
RELEASE_ASSERT.
This reverts commit ea4b17533c.
Change-Id: I9fec45196646f67ae46efccc2f83a43e8941a626
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/149592
Reviewed-by: David Morgan <davidmorgan@google.com>
Commit-Queue: Martin Kustermann <kustermann@google.com>