Kostia Sokolovskyi 66281ce520
[web] Remove all usages of js_util. (#171871)
Closes https://github.com/flutter/flutter/issues/143396

### Description
- Removes `js_util` library usage across the codebase

In order to get rid of `dart.library.js_util` in
[`kIsWeb`](e8d56b25c0/packages/flutter/lib/src/foundation/constants.dart (L83))
constant the dart analyzer has to be updated first. For now, the
`dart.library.js_util` value is hardcoded in the source code:
1a88edceb7/pkg/analyzer/lib/src/dart/constant/evaluation.dart (L2908-L2915).
So we either have to update this value or wait for the
https://github.com/dart-lang/sdk/issues/50045 fix.

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we expect every widget to implement].
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- [X] I listed at least one issue that this PR fixes in the description
above.
- [ ] I updated/added relevant documentation (doc comments with `///`).
- [ ] I added new tests to check the change I am making, or this PR is
[test-exempt].
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Fixes] where supported.
- [X] All existing and new tests are passing.

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2025-07-16 16:00:58 +00:00
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