This reverts commit da95aca.

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Reverts: #169273
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Initiated by: jason-simmons
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Reason for reverting: seeing flakes of `dart_data_asset_test.dart`

CI runs for various PRs got errors in the `tool_integration_tests`
shards. The errors occurred on multiple platforms (Linux, Mac, and
Windows).

Affected PRs include: #170022,
#169995

LUCI log of an error:
https://ci.chromium.org/ui/p/flutter/builders/try/Windows%20t
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Original PR Author: mosuem
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Reviewed By: {bkonyi}
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This change reverts the following previous change:
Refiling of #164094, which itself is a rebase of #159675

This PR adds bundling support for the experimental dart data asset
feature: Dart packages with hooks can now emit data assets which the
flutter tool will bundle.

It relies on flutter's existing asset bundling mechanism (e.g. entries
in AssetManifest.json, DevFS syncing in reload/restart, ...).

The support is added under an experimental flag (similar to the existing
native assets experimental flag).

Also, kNativeAssets is removed to also bundle data assets on flutter
build bundle.

The chrome sandbox is disabled as per #165664.

## Pre-launch Checklist

- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [x] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.

If you need help, consider asking for advice on the #hackers-new channel
on [Discord].

<!-- Links -->
[Contributor Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#overview
[Tree Hygiene]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md
[test-exempt]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#tests
[Flutter Style Guide]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md
[Features we expect every widget to implement]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Style-guide-for-Flutter-repo.md#features-we-expect-every-widget-to-implement
[CLA]: https://cla.developers.google.com/
[flutter/tests]: https://github.com/flutter/tests
[breaking change policy]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Tree-hygiene.md#handling-breaking-changes
[Discord]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Chat.md
[Data Driven Fixes]:
https://github.com/flutter/flutter/blob/main/docs/contributing/Data-driven-Fixes.md

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Co-authored-by: auto-submit[bot] <[email protected]>