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**Description**
This pull request removes the unnecessary setAriaRole('dialog') fallback
in the SemanticRoute class within the Flutter web engine. This line was
an old fallback and is no longer needed
**Before**
https://dialog-0505-before.web.app/
**After**
https://dialog-050502-after.web.app/
**Issue Fixed**
This PR addresses GitHub Issue #168247, which proposes reconsidering the
application of role="dialog" to arbitrary routes.
## 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].
- [ ] 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.
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