Fix crash in DirectoryImpl::Flush()

components/filesystem/directory_impl.cc

Index: components/filesystem/directory_impl.cc
diff --git a/components/filesystem/directory_impl.cc b/components/filesystem/directory_impl.cc
index 5174477a3fce3e85703e369b588bd6461af2a1a7..8577078a0da2771108e1ba83a084a36ec940e7b3 100644
--- a/components/filesystem/directory_impl.cc
+++ b/components/filesystem/directory_impl.cc
@@ -224,7 +224,8 @@ void DirectoryImpl::IsWritable(const std::string& raw_path,
 }
 
 void DirectoryImpl::Flush(const FlushCallback& callback) {
-  base::File file(directory_path_, base::File::FLAG_READ);
+  base::File file(directory_path_,
+                  base::File::FLAG_OPEN | base::File::FLAG_READ);
   if (!file.IsValid()) {
     callback.Run(GetError(file));
     return;