HTTP loading tests and package root support

tests/standalone/http_launch_data/http_launch_main.dart

Index: tests/standalone/http_launch_data/http_launch_main.dart
diff --git a/tests/compiler/dart2js_extra/regress/4434_test.dart b/tests/standalone/http_launch_data/http_launch_main.dart
similarity index 71%
copy from tests/compiler/dart2js_extra/regress/4434_test.dart
copy to tests/standalone/http_launch_data/http_launch_main.dart
index 0f23991ee3f1d7ec5da12b50a40d1ebea6459e4b..eb2fd79c3a980ca2e819f936713befabef14d79c 100644
--- a/tests/compiler/dart2js_extra/regress/4434_test.dart
+++ b/tests/standalone/http_launch_data/http_launch_main.dart
@@ -2,13 +2,11 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-library lib_b;
 
-import '4434_lib.dart';
+library http_lanuch_main;
 
-class B extends A { }
+import 'package:simple/simple.dart';
 
 main() {
-  B b = new B();
-  b.x(b);
-}
+  print(getSimpleString());
+}