[bt][sco] Use unique_ptr/WeakPtr for ScoConnections instead of RefPtr

Model ownership of ScoConnection using std::unique_ptr and fxl::WeakPtr
instead of fbl::RefPtr. This makes the ownership model clearer and
reduces usage of fbl, which we can't use on Pigweed.

Bug: 100658
Test: fx test //src/connectivity/bluetooth/core/bt-host
Change-Id: Icce164fab33fa5733a237e77d88e738bd335999a
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/692091
Reviewed-by: Xo Wang <xow@google.com>
Commit-Queue: Ben Lawson <benlawson@google.com>
9 files changed
tree: 545061d579a6760b5d00e6c3fbf9fbd5477d3d2c
  1. boards/
  2. build/
  3. bundles/
  4. docs/
  5. examples/
  6. products/
  7. scripts/
  8. sdk/
  9. src/
  10. third_party/
  11. tools/
  12. zircon/
  13. .clang-format
  14. .clang-tidy
  15. .editorconfig
  16. .git-blame-ignore-revs
  17. .gitattributes
  18. .gitignore
  19. .gn
  20. .style.yapf
  21. analysis_options.yaml
  22. AUTHORS
  23. BUILD.gn
  24. CODE_OF_CONDUCT.md
  25. CONTRIBUTING.md
  26. LICENSE
  27. OWNERS
  28. PATENTS
  29. pyrightconfig.json
  30. README.md
  31. rustfmt.toml
README.md

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