Add flag to enable syncfs directory support to about:flags.

webkit/fileapi/syncable/syncable_file_system_util.cc

Index: webkit/fileapi/syncable/syncable_file_system_util.cc
diff --git a/webkit/fileapi/syncable/syncable_file_system_util.cc b/webkit/fileapi/syncable/syncable_file_system_util.cc
index e785ba46d4d91002261c0a231998c99dc051b4da..1dbfda5b5bb0ff80b9726c51d50b094b367cd787 100644
--- a/webkit/fileapi/syncable/syncable_file_system_util.cc
+++ b/webkit/fileapi/syncable/syncable_file_system_util.cc
@@ -23,7 +23,8 @@ namespace {
 // A command switch to enable syncing directory operations in Sync FileSystem
 // API. (http://crbug.com/161442)
 // TODO(kinuko): this command-line switch should be temporary.
-const char kEnableSyncDirectoryOperation[]  = "enable-sync-directory-operation";
+const char kEnableSyncDirectoryOperation[]  =
+    "enable-syncfs-directory-operation";
 
 bool is_directory_operation_enabled = false;