Cancel MIDI permission request infobar on MIDIAccess stop.

chrome/browser/media/chrome_midi_permission_context.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_MEDIA_CHROME_MIDI_PERMISSION_CONTEXT_H_
 #define CHROME_BROWSER_MEDIA_CHROME_MIDI_PERMISSION_CONTEXT_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "components/browser_context_keyed_service/browser_context_keyed_service.h"
 #include "content/public/browser/browser_context.h"
 
 class GURL;
 class PermissionQueueController;
 class PermissionRequestID;
 class Profile;
 
 // This class manages MIDI permissions flow. Used on the UI thread.
 class ChromeMIDIPermissionContext : public BrowserContextKeyedService {
  public:
   explicit ChromeMIDIPermissionContext(Profile* profile);
   virtual ~ChromeMIDIPermissionContext();
 
   // BrowserContextKeyedService methods:
   virtual void Shutdown() OVERRIDE;
 
   // Request to ask users permission about MIDI.
   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,
   // or NotifyPermissionSet if permission decided by presenting an infobar.
   void DecidePermission(
       const PermissionRequestID& id,
       const GURL& requesting_frame,
       const GURL& embedder,
       const content::BrowserContext::MIDISysExPermissionCallback& callback);
 
   // Called when permission is granted without interactively asking the user.
   void PermissionDecided(
       const PermissionRequestID& id,
       const GURL& requesting_frame,
       const GURL& embedder,
       const content::BrowserContext::MIDISysExPermissionCallback& callback,
       bool allowed);
 
   // Called when the permission decision is made. It may be by the
   // InfoBarDelegate to notify permission has been set.
   void NotifyPermissionSet(
       const PermissionRequestID& id,
       const GURL& requesting_frame,
       const content::BrowserContext::MIDISysExPermissionCallback& callback,
       bool allowed);
 
   // 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_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeMIDIPermissionContext);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_CHROME_MIDI_PERMISSION_CONTEXT_H_