f124f0fcfc
Removes the private extension to heap snapshots, which did not represent nesting. Change-Id: I62e60922f094db68cf63bac037140e1a8b2b9fd7 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/152424 Commit-Queue: Ryan Macnak <rmacnak@google.com> Reviewed-by: Ben Konyi <bkonyi@google.com>