Cancel MIDI permission request infobar on MIDIAccess stop.

content/common/media/midi_messages.h

 // Copyright (c) 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.
 
 // IPC messages for access to MIDI hardware.
 // Multiply-included message file, hence no include guard.
 
 #include "base/basictypes.h"
 #include "content/common/content_export.h"
 #include "ipc/ipc_message_macros.h"
@@ skipping 12 matching lines @@
 IPC_STRUCT_TRAITS_END()
 
 // Messages for IPC between MIDIDispatcher and MIDIDispatcherHost.
 
 // Renderer request to browser for using system exclusive messages.
 IPC_MESSAGE_CONTROL3(MIDIHostMsg_RequestSysExPermission,
                      int /* routing id */,
                      int /* client id */,
                      GURL /* origin */)
 
+// Renderer request to browser for canceling a previous permission request.
+IPC_MESSAGE_CONTROL3(MIDIHostMsg_CancelSysExPermissionRequest,
+                     int /* render_view_id */,
+                     int /* bridge_id */,
+                     GURL /* GURL of the frame */)
+
 // Messages sent from the browser to the renderer.
 
 IPC_MESSAGE_ROUTED2(MIDIMsg_SysExPermissionApproved,
                     int /* client id */,
                     bool /* success */)
 
 // Messages for IPC between MIDIMessageFilter and MIDIHost.
 
 // Renderer request to browser for access to MIDI services.
 IPC_MESSAGE_CONTROL1(MIDIHostMsg_StartSession,
@@ skipping 12 matching lines @@
                      media::MIDIPortInfoList /* input ports */,
                      media::MIDIPortInfoList /* output ports */)
 
 IPC_MESSAGE_CONTROL3(MIDIMsg_DataReceived,
                      uint32 /* port */,
                      std::vector<uint8> /* data */,
                      double /* timestamp */)
 
 IPC_MESSAGE_CONTROL1(MIDIMsg_AcknowledgeSentData,
                      uint32 /* bytes sent */)