Cancel MIDI permission request infobar on MIDIAccess stop.

chrome/browser/media/chrome_midi_permission_context.h

Index: chrome/browser/media/chrome_midi_permission_context.h
diff --git a/chrome/browser/media/chrome_midi_permission_context.h b/chrome/browser/media/chrome_midi_permission_context.h
index 7f2ff328408cb19840e6aba5bf2bed88ecef84f6..cae2e76cd7fe022483f4ff9000bb4de526ef9046 100644
--- a/chrome/browser/media/chrome_midi_permission_context.h
+++ b/chrome/browser/media/chrome_midi_permission_context.h
@@ -27,9 +27,16 @@ class ChromeMIDIPermissionContext : public BrowserContextKeyedService {
   void RequestMIDISysExPermission(
       int render_process_id,
       int render_view_id,
+      int bridge_id,
       const GURL& requesting_frame,
       const content::BrowserContext::MIDISysExPermissionCallback& callback);
 
+  // Cancel a pending MIDI permission request.
+  void CancelMIDISysExPermissionRequest(int render_process_id,
+                                        int render_view_id,
+                                        int bridge_id,
+                                        const GURL& requesting_frame);
+
  private:
   // Decide whether the permission should be granted.
   // Calls PermissionDecided if permission can be decided non-interactively,
@@ -59,6 +66,9 @@ class ChromeMIDIPermissionContext : public BrowserContextKeyedService {
   // Return an instance of the infobar queue controller, creating it if needed.
   PermissionQueueController* GetQueueController();
 
+  // Removes any pending InfoBar request.
+  void CancelPendingInfoBarRequest(const PermissionRequestID& id);
+
   Profile* const profile_;
   bool shutting_down_;
   scoped_ptr<PermissionQueueController> permission_queue_controller_;