Delete unused decode UTF-8, JSON functions (#18360)

These were added in 7e5d63513a7ae854605dbd38582cead55594e9f0 for use in
_handleNavigationMessage. That function was deleted in
f37aafd456fc6a1c2dba5bc1b63123b0e665e6cd, but the support methods were
left in the code. `// ignore: unused` annotations were added to all
private native entry points by dnfield (to work around what is arguably
a bug) in 6179ac637724e8f93b7f3c8dcfda93a6b9b7995e, and were applied to
these two methods, I suspect unintentionally.

In any case, they appear entirely unused at present.
1 file changed
tree: f99a6b8dfa11c2c2f7f7fe4a0540600c60734c13
  1. .github/
  2. assets/
  3. benchmarking/
  4. build/
  5. ci/
  6. common/
  7. docs/
  8. e2etests/
  9. examples/
  10. flow/
  11. flutter_frontend_server/
  12. fml/
  13. lib/
  14. runtime/
  15. shell/
  16. sky/
  17. testing/
  18. third_party/
  19. tools/
  20. vulkan/
  21. web_sdk/
  22. .cirrus.yml
  23. .clang-format
  24. .gitattributes
  25. .gitignore
  26. analysis_options.yaml
  27. AUTHORS
  28. BUILD.gn
  29. CONTRIBUTING.md
  30. DEPS
  31. Doxyfile
  32. LICENSE
  33. README.md
README.md

Flutter Engine

Build Status - Cirrus

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