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

tests/standalone/io/web_socket_test.dart

Index: tests/standalone/io/web_socket_test.dart
diff --git a/tests/standalone/io/web_socket_test.dart b/tests/standalone/io/web_socket_test.dart
index 26d3202e6d308686c27eb8780718fd3c0099030f..2e45a39fe8419d005ff897ec9a183e1c2dc9f6fc 100644
--- a/tests/standalone/io/web_socket_test.dart
+++ b/tests/standalone/io/web_socket_test.dart
@@ -408,7 +408,7 @@ class SecurityConfiguration {
 
 
 void initializeSSL() {
-  var testPkcertDatabase = join(dirname(Platform.script), 'pkcert');
+  var testPkcertDatabase = Platform.script.resolve('pkcert').toFilePath();
   SecureSocket.initialize(database: testPkcertDatabase,
                           password: "dartdart");
 }