drop --harmony flag for chrome canary e2e test

test/transformer_e2e_test.dart

diff --git a/test/transformer_e2e_test.dart b/test/transformer_e2e_test.dart
index d4193cc..1925df9 100644
--- a/test/transformer_e2e_test.dart
+++ b/test/transformer_e2e_test.dart
@@ -39,7 +39,7 @@
       if (chromeBin != null) {
         capabilities['chromeOptions'] = {
           'binary': chromeBin,
-          'args': ['--no-sandbox', '--js-flags=--harmony'],
+          'args': ['--no-sandbox'],
         };
       }
       webdriver = await WebDriver.createDriver(