Reverts flutter/flutter#127052, which seems to be breaking the build
because of a goldens failure.

```
The following TestFailure was thrown running a test:
Expected: one widget whose rasterized image matches golden image "shadow.PhysicalModel.enabled.png"
  Actual: _WidgetTypeFinder:<exactly one widget with type "Container" (ignoring offstage widgets):
Container(bg: Color(0xfffff59d), margin: EdgeInsets.all(150.0))>
```

See
https://ci.chromium.org/ui/p/flutter/builders/prod/Linux%20web_tests_6/11051/overview