remove c++11 enum scope in copy_or_move_operation_delegate.cc

Followup to CL 469993007, which added a c++11 style enum scope,
but we haven't officially switched to c++11 yet.

BUG=360088

Review URL: https://codereview.chromium.org/562513005

Cr-Commit-Position: refs/heads/master@{#294358}

storage/browser/fileapi/copy_or_move_operation_delegate.cc

@@ -799,7 +799,7 @@ void CopyOrMoveOperationDelegate::ProcessFile(
       (file_system_context()
            ->GetFileSystemBackend(src_url.type())
            ->HasInplaceCopyImplementation(src_url.type()) ||
-       operation_type_ == OperationType::OPERATION_MOVE)) {
+       operation_type_ == OPERATION_MOVE)) {
     impl = new CopyOrMoveOnSameFileSystemImpl(
         operation_runner(), operation_type_, src_url, dest_url, option_,
         base::Bind(&CopyOrMoveOperationDelegate::OnCopyFileProgress,