Files.app: Fix the flakyness in CreateNewFolderTest and re-enable it

chrome/browser/chromeos/file_manager/file_manager_browsertest.cc

Index: chrome/browser/chromeos/file_manager/file_manager_browsertest.cc
diff --git a/chrome/browser/chromeos/file_manager/file_manager_browsertest.cc b/chrome/browser/chromeos/file_manager/file_manager_browsertest.cc
index 57371aae99105a7415810066b9ef0eb2f3188691..97d73d29295463e4812f32260dafc9ee5703fe73 100644
--- a/chrome/browser/chromeos/file_manager/file_manager_browsertest.cc
+++ b/chrome/browser/chromeos/file_manager/file_manager_browsertest.cc
@@ -815,9 +815,14 @@ WRAPPED_INSTANTIATE_TEST_CASE_P(
         TestParameter(NOT_IN_GUEST_MODE, "audioRepeatMultipleFileDrive"),
         TestParameter(NOT_IN_GUEST_MODE, "audioNoRepeatMultipleFileDrive")));
 
-// Disabled due to frequent failure: http://crbug.com/377636
+// Slow tests are disabled on debug build. http://crbug.com/327719
+#if !defined(NDEBUG)
+#define MAYBE_CreateNewFolder DISABLED_CreateNewFolder
+#else
+#define MAYBE_CreateNewFolder CreateNewFolder
+#endif
 INSTANTIATE_TEST_CASE_P(
-    DISABLED_CreateNewFolder,
+    MAYBE_CreateNewFolder,
     FileManagerBrowserTest,
     ::testing::Values(TestParameter(NOT_IN_GUEST_MODE,
                                     "createNewFolderAfterSelectFile"),