Web MIDI: fix a regression of r430234

components/test_runner/mock_web_midi_accessor.h

Index: components/test_runner/mock_web_midi_accessor.h
diff --git a/components/test_runner/mock_web_midi_accessor.h b/components/test_runner/mock_web_midi_accessor.h
index 150ea54d2df4bbf6edc0c7d3af9f13fe105287d9..c3115738478a8c1c80342676a0520e58502a48d4 100644
--- a/components/test_runner/mock_web_midi_accessor.h
+++ b/components/test_runner/mock_web_midi_accessor.h
@@ -34,10 +34,14 @@ class MockWebMIDIAccessor : public blink::WebMIDIAccessor {
                     double timestamp) override;
 
  private:
-  void ReportStartedSession(midi::mojom::Result result);
+  void addInputPort(midi::mojom::PortState state);
+  void addOutputPort(midi::mojom::PortState state);
+  void reportStartedSession(midi::mojom::Result result);
 
   blink::WebMIDIAccessorClient* client_;
   TestInterfaces* interfaces_;
+  unsigned max_input_port_index_;
+  unsigned max_output_port_index_;
 
   base::WeakPtrFactory<MockWebMIDIAccessor> weak_factory_;