Steps to Reproduce

Using a Windows computer From flutter/flutter repository root:

1. cd packages/flutter
2. flutter test --platform=chrome .\test\widgets\router_test.dart

Expected results:

The test should run.

Actual results:

The tool crashes with this:

Error: Error when reading 'c:/code/flutter/flutter/bin/cache/flutter_web_sdk/kernel/ddc_outline.dill': StandardFileSystem only supports file:* and data:* URIs

I checked and c:/code/flutter/flutter/bin/cache/flutter_web_sdk/kernel/ddc_outline.dill does exist. Perhaps it's complaining about the / in a Windows path?

I reproduced it in 19ef0f9

I'm suspecting this started with flutter/engine#37940, but I don't have a proof.