Revert "[vm/precomp] Use @pragma("vm:exact-result-type") to specify method behavior."

This reverts commit ade6742ee9c7cba55679b5eb6864c3607d5ad405.

Reason for revert: Some service tests are broken.

Original change's description:
> [vm/precomp] Use @pragma("vm:exact-result-type") to specify method behavior.
> 
> Cq-Include-Trybots: luci.dart.try:vm-kernel-win-release-x64-try,vm-kernel-optcounter-threshold-linux-release-x64-try,vm-kernel-precomp-linux-debug-x64-try,vm-kernel-precomp-linux-release-simarm-try,vm-kernel-precomp-linux-release-simarm64-try,vm-kernel-precomp-linux-release-x64-try,vm-kernel-precomp-win-release-x64-try
> Change-Id: I6eeafeea734efb2e876c5e03f12092b5229ad2bc
> Reviewed-on: https://dart-review.googlesource.com/70284
> Commit-Queue: Samir Jindel <sjindel@google.com>
> Reviewed-by: Alexander Markov <alexmarkov@google.com>

TBR=vegorov@google.com,alexmarkov@google.com,sjindel@google.com

Change-Id: If95f68704737b1da7553c68eb4e22a4c554d3a4b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Cq-Include-Trybots: luci.dart.try:vm-kernel-win-release-x64-try, vm-kernel-optcounter-threshold-linux-release-x64-try, vm-kernel-precomp-linux-debug-x64-try, vm-kernel-precomp-linux-release-simarm-try, vm-kernel-precomp-linux-release-simarm64-try, vm-kernel-precomp-linux-release-x64-try, vm-kernel-precomp-win-release-x64-try
Reviewed-on: https://dart-review.googlesource.com/72200
Reviewed-by: Samir Jindel <sjindel@google.com>
Commit-Queue: Samir Jindel <sjindel@google.com>
36 files changed
tree: d8ff22504fe685e7acbd466fc0a2e6f88a679d10
  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
README.md

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