Create generated tests inside the build directory

pkg/intl/test/date_time_format_http_request_test.dart

Index: pkg/intl/test/date_time_format_http_request_test.dart
diff --git a/pkg/intl/test/date_time_format_http_request_test.dart b/pkg/intl/test/date_time_format_http_request_test.dart
index 139cf6d62bdb32049f92aaf1c4039becfac96894..65bc87b5f27588aa71726f1e3dda070896493a14 100644
--- a/pkg/intl/test/date_time_format_http_request_test.dart
+++ b/pkg/intl/test/date_time_format_http_request_test.dart
@@ -21,7 +21,7 @@ var url = '';
 
 main() {
   useHtmlConfiguration();
-  url = "http://localhost:${window.location.port}/pkg/intl/lib/src/data/dates/";
+  url = "http://localhost:${window.location.port}/root_dart/pkg/intl/lib/src/data/dates/";
   // Initialize one locale just so we know what the list is.
   test('Run everything', () {
     initializeDateFormatting("en_US", url).then(expectAsync1(runEverything));});