Avoid the deprecated input error in source_loader

Avoid using deprecated errors by hadling them on a case-by-case basis.
This is a version of https://dart-review.googlesource.com/c/sdk/+/63144
with merge conflicts resolved.

Fixes #33686

Change-Id: I726740af2db5d32f15c8103c903376bc8ea948e6
Reviewed-on: https://dart-review.googlesource.com/71161
Reviewed-by: Kevin Millikin <kmillikin@google.com>
Commit-Queue: Kevin Millikin <kmillikin@google.com>
31 files changed
tree: ea2c2157ebfc7f56b644fb08fb1dfb7c9b06bd40
  1. .github/
  2. build/
  3. client/
  4. docs/
  5. pkg/
  6. runtime/
  7. samples/
  8. samples-dev/
  9. sdk/
  10. tests/
  11. third_party/
  12. tools/
  13. utils/
  14. .clang-format
  15. .gitattributes
  16. .gitconfig
  17. .gitignore
  18. .gn
  19. .mailmap
  20. .packages
  21. AUTHORS
  22. BUILD.gn
  23. CHANGELOG.md
  24. codereview.settings
  25. CONTRIBUTING.md
  26. dartdoc_options.yaml
  27. DEPS
  28. LICENSE
  29. PATENTS
  30. PRESUBMIT.py
  31. README.dart-sdk
  32. README.md
  33. WATCHLISTS
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