[fidl] Revert "Allow flexible/strict modifiers for unions"

This reverts commit bf2ff3266e4ff5e1981426a1aa4a7904c63e378e.

Reason for revert: breaks topaz tests due to fidlgen goldens changing

Original change's description:
> [fidl] Allow flexible/strict modifiers for unions
> 
> 1. Rename "experimental_flexible" to just "flexible". This is required
>    for removing the "xunion" keyword, which will be replaced by
>    "flexible union" instead.
> 
> 2. Add strictness information to unions in fidlc, and emit a "strict"
>    field in the JSON IR similarly to xunions. (Note that "union"
>    defaults to strict, while "xunion" defaults to flexible.)
> 
> 3. Update fidlgen's IR in types.go to carry strictness information, and
>    plumb the union strictness through when unions are converted to
>    xunions.
> 
> 4. Update grammar.md to include both strict & flexible as legal tokens.
> 
> Test: fx run-host-tests fidl-compiler-test
> Test: (goldens)
> 
> Change-Id: I83591bdb3f5594baedc0327adb562f263fa77d79

TBR=apang@google.com,pascallouis@google.com,fcz@google.com,mkember@google.com

Change-Id: I843bf073a3a39a0c540acdcc3370c4cbbab9843a
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
32 files changed
tree: 54dd4bf8ae95f22f6f12c6502e4cf05239543106
  1. boards/
  2. build/
  3. bundles/
  4. docs/
  5. examples/
  6. garnet/
  7. peridot/
  8. products/
  9. scripts/
  10. sdk/
  11. src/
  12. third_party/
  13. tools/
  14. zircon/
  15. .clang-format
  16. .clang-tidy
  17. .dir-locals.el
  18. .gitattributes
  19. .gitignore
  20. .gn
  21. .style.yapf
  22. AUTHORS
  23. BUILD.gn
  24. CODE_OF_CONDUCT.md
  25. CONTRIBUTING.md
  26. LICENSE
  27. OWNERS
  28. PATENTS
  29. README.md
  30. 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.

How can I build and run Fuchsia?

See Getting Started.

Where can I learn more about Fuchsia?

See fuchsia.dev.