Revert "[a11y] Adds callback to notify screen reader when TTS engine connects."

This reverts commit 9e7e8382f1a052caace6c38ba7546685b323f1d6.

Reason for revert: fxb/64156

Original change's description:
> [a11y] Adds callback to notify screen reader when TTS engine connects.
>
> This change adds a mechanism for the screen reader to be notified when
> the TTS engine is ready to produce output.
>
> TEST: fx test a11y_lib_tests; fx test a11y_tests
> Change-Id: I03e501ce1e99ec88ee02cd6cd2ffad9c90612b15
> Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/445219
> Reviewed-by: Lucas Radaelli <lucasradaelli@google.com>
> Testability-Review: Lucas Radaelli <lucasradaelli@google.com>
> Commit-Queue: Alexander Brusher <abrusher@google.com>

TBR=abrusher@google.com,lucasradaelli@google.com

# Not skipping CQ checks because original CL landed > 1 day ago.

Change-Id: I94a0059e6e5159f7a0bb9e824bf6aaa062d7cd3d
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/450195
Reviewed-by: Alexander Brusher <abrusher@google.com>
Commit-Queue: Alexander Brusher <abrusher@google.com>
12 files changed
tree: 6e3a690e2e712d8beba40af764cad29448881e6c
  1. boards/
  2. build/
  3. bundles/
  4. docs/
  5. examples/
  6. garnet/
  7. products/
  8. scripts/
  9. sdk/
  10. src/
  11. third_party/
  12. tools/
  13. zircon/
  14. .clang-format
  15. .clang-tidy
  16. .gitattributes
  17. .gitignore
  18. .gn
  19. .style.yapf
  20. AUTHORS
  21. BUILD.gn
  22. CODE_OF_CONDUCT.md
  23. CONTRIBUTING.md
  24. LICENSE
  25. OWNERS
  26. PATENTS
  27. README.md
  28. rustfmt.toml
README.md

Fuchsia

Pink + Purple == Fuchsia (a new operating system)

What is Fuchsia?

Fuchsia is a modular, capability-based operating system. Fuchsia runs on modern 64-bit Intel and ARM processors.

Fuchsia is an open source project with a code of conduct that we expect everyone who interacts with the project to respect.

Read more about Fuchsia's principles.

How can I build and run Fuchsia?

See Getting Started.

Where can I learn more about Fuchsia?

See fuchsia.dev.