Revert "Check void usage and invalid returns"

This reverts commit 11001793a2ab7a3ccc2b15c54dd61a14576cac16.

Reason for revert: Doesn't allow void to void assignment. This is breaks a lot of packages.

Original change's description:
> Check void usage and invalid returns
>
> Closes https://github.com/dart-lang/sdk/issues/30470
>
> Change-Id: I2ed5b54c74e0bba2771036774bbe2197ce29109d
> Reviewed-on: https://dart-review.googlesource.com/65141
> Commit-Queue: Peter von der Ahé <ahe@google.com>
> Reviewed-by: Dmitry Stefantsov <dmitryas@google.com>

TBR=ahe@google.com,dmitryas@google.com

Change-Id: I78f479cf8b0824dd338ae43a5514f320fd112a3f
Reviewed-on: https://dart-review.googlesource.com/66040
Reviewed-by: Leaf Petersen <leafp@google.com>
Reviewed-by: Mike Fairhurst <mfairhurst@google.com>
Commit-Queue: Mike Fairhurst <mfairhurst@google.com>
57 files changed
tree: d55e8ce4ac2bb4fc97e5927350fda23b09dcdeb7
  1. .clang-format
  2. .gitattributes
  3. .gitconfig
  4. .github/
  5. .gitignore
  6. .gn
  7. .mailmap
  8. .packages
  9. AUTHORS
  10. BUILD.gn
  11. CHANGELOG.md
  12. DEPS
  13. LICENSE
  14. PATENTS
  15. PRESUBMIT.py
  16. README.dart-sdk
  17. README.md
  18. WATCHLISTS
  19. build/
  20. client/
  21. codereview.settings
  22. dartdoc_options.yaml
  23. docs/
  24. foo
  25. pkg/
  26. runtime/
  27. samples-dev/
  28. samples/
  29. sdk/
  30. tests/
  31. third_party/
  32. tools/
  33. utils/
README.md

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