Revert label failed due to conflicts

`FlutterFragmentTest.java` was the only file that had merge issues, everything else is the output of `git revert 00e72e9cecb138e001f5625ff67a370aabd3e3c5`

[C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style