#ifndef CONTENT_CHILD_INDEXED_DB_INDEXED_DB_MESSAGE_FILTER_H_
#define CONTENT_CHILD_INDEXED_DB_INDEXED_DB_MESSAGE_FILTER_H_
+#include "base/memory/ref_counted.h"
#include "content/child/child_message_filter.h"
struct IndexedDBDatabaseMetadata;
namespace base {
class MessageLoopProxy;
-} // namespace base
+}
+
+namespace IPC {
+class Message;
+}
namespace content {