1 files changed, 3 insertions, 1 deletions
diff --git a/chromium/media/midi/midi_manager_win.h b/chromium/media/midi/midi_manager_win.h
index f3f6093f603..3d23a59fa50 100644
--- a/chromium/media/midi/midi_manager_win.h
+++ b/chromium/media/midi/midi_manager_win.h
@@ -28,6 +28,8 @@ class MidiManagerWin final
  public:
   class PortManager;
 
+  MIDI_EXPORT static void OverflowInstanceIdForTesting();
+
   explicit MidiManagerWin(MidiService* service);
   ~MidiManagerWin() override;
 
@@ -84,7 +86,7 @@ class MidiManagerWin final
                         const std::vector<uint8_t>& data);
 
   // Holds an unique instance ID.
-  const int instance_id_;
+  const int64_t instance_id_;
 
   // Keeps a TaskRunner for the I/O thread.
   scoped_refptr<base::SingleThreadTaskRunner> thread_runner_;