49e8ec8b0b
This reverts commit dce75ab4cf647eec6699f8a30ba2289a3738b307. This also makes some small changes to make onBenchmark a JSExportedDartFunction instead of a JSBoxedDartObject. This is for changes in https://github.com/flutter/flutter/pull/129436 and to account for the fact that flutter/packages provides an `allowInterop`'d function. Benchmarks tests pass with this CL. ## Pre-launch Checklist - [X] I read the [Contributor Guide] and followed the process outlined there for submitting PRs. - [X] I read the [Tree Hygiene] wiki page, which explains my responsibilities. - [X] I read and followed the [Flutter Style Guide] and the [C++, Objective-C, Java style guides]. - [X] I listed at least one issue that this PR fixes in the description above. - [ ] I added new tests to check the change I am making or feature I am adding, or Hixie said the PR is test-exempt. See [testing the engine] for instructions on writing and running engine tests. - [X] I updated/added relevant documentation (doc comments with `///`). - [X] I signed the [CLA]. - [ ] All existing and new tests are passing.