Fix up paths

Author: srujzs

dwds/test/fixtures/context.dart

@@ -322,10 +322,12 @@ class TestContext {
             _webRunner = ResidentWebRunner(
               mainUri: entry,
               urlTunneler: debugSettings.urlEncoder,
-              projectDirectory: p.toUri(project.absolutePackageDirectory),
+              projectDirectory: Directory(project.absolutePackageDirectory).uri,
               packageConfigFile: project.packageConfigFile,
               packageUriMapper: packageUriMapper,
-              fileSystemRoots: [p.toUri(project.absolutePackageDirectory)],
+              fileSystemRoots: [
+                Directory(project.absolutePackageDirectory).uri,
+              ],
               fileSystemScheme: 'org-dartlang-app',
               outputPath: outputDir.path,
               compilerOptions: compilerOptions,

dwds/test/fixtures/project.dart

@@ -22,12 +22,9 @@ class TestProject {
   late Directory _fixturesCopy;
 
   /// The top level directory in which we run the test server, e.g.
-  /// "/tmp/_testSound/".
+  /// "/tmp/_testSound".
   String get absolutePackageDirectory =>
-      // Return it as a directory with a trailing slash.
-      Directory.fromUri(
-        _fixturesCopy.absolute.uri.resolve(packageDirectory),
-      ).uri.path;
+      _fixturesCopy.absolute.uri.resolve(packageDirectory).path;
 
   /// The directory to build and serve, e.g. "example".
   String get directoryToServe => p.split(webAssetsPath).first;
@@ -243,7 +240,6 @@ class TestProject {
     try {
       _fixturesCopy.deleteSync(recursive: true);
     } on FileSystemException catch (_) {
-      assert(Platform.isWindows);
       // On Windows, the build daemon process might still be accessing the
       // working directory, so try again with an exponential backoff.
       var seconds = 1;