Update a couple other references to sunflower that I missed

tests/compiler/dart2js/source_map_pub_build_validity_test.dart

Index: tests/compiler/dart2js/source_map_pub_build_validity_test.dart
diff --git a/tests/compiler/dart2js/source_map_pub_build_validity_test.dart b/tests/compiler/dart2js/source_map_pub_build_validity_test.dart
index 8aabf5d4ab357c3c25d1ec40f6048de6912443de..46b671edac6ef68c4ad57df004e606334e0759ea 100644
--- a/tests/compiler/dart2js/source_map_pub_build_validity_test.dart
+++ b/tests/compiler/dart2js/source_map_pub_build_validity_test.dart
@@ -12,7 +12,7 @@ import 'source_map_validator_helper.dart';
 void main() {
   asyncTest(() => createTempDir().then((Directory tmpDir) {
     Directory sunflowerDir = new Directory.fromUri(
-        Platform.script.resolve('../../../samples/sunflower'));
+        Platform.script.resolve('../../../third_party/sunflower'));
 
     print("Copying '${sunflowerDir.path}' to '${tmpDir.path}'.");
     copyDirectory(sunflowerDir, tmpDir);
@@ -29,4 +29,4 @@ void main() {
       tmpDir.deleteSync(recursive: true);
     });
   }));
-}
+}