Change dart:io Platform.script to return a URI. Change all uses of Platform.script to work with th…

tests/standalone/io/code_collection_test.dart

Index: tests/standalone/io/code_collection_test.dart
diff --git a/tests/standalone/io/code_collection_test.dart b/tests/standalone/io/code_collection_test.dart
index 80a19155148c23270768979a03116aeba0098a87..f0e4ef881b8bf39a03f3bfd4d6d8891a6598732b 100644
--- a/tests/standalone/io/code_collection_test.dart
+++ b/tests/standalone/io/code_collection_test.dart
@@ -51,7 +51,7 @@ main(List<String> arguments) {
          "--log-code-drop",
          "--optimization-counter-threshold=-1",
          "--package-root=${Platform.packageRoot}",
-         Platform.script,
+         Platform.script.toFilePath(),
          "--run"]);
 
     // Code drops are logged with --log-code-drop. Look through stdout for the