Only grant MidiSysExMessage if needed.

content/browser/renderer_host/media/midi_dispatcher_host.cc

 // 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.
 
 #include "content/browser/renderer_host/media/midi_dispatcher_host.h"
 
 #include "base/bind.h"
 #include "content/browser/child_process_security_policy_impl.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/common/media/midi_messages.h"
@@ skipping 54 matching lines @@
     int bridge_id,
     const GURL& requesting_frame) {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
   DVLOG(1) << __FUNCTION__ << " " << render_process_id_ << ":" << render_view_id
            << ":" << bridge_id;
   browser_context_->CancelMidiSysExPermissionRequest(
       render_process_id_, render_view_id, bridge_id, requesting_frame);
 }
 void MidiDispatcherHost::WasSysExPermissionGranted(int render_view_id,
                                                    int bridge_id,
-                                                   bool success) {
-  ChildProcessSecurityPolicyImpl::GetInstance()->GrantSendMidiSysExMessage(
-      render_process_id_);
-  Send(new MidiMsg_SysExPermissionApproved(render_view_id, bridge_id, success));
+                                                   bool is_allowed) {
+  if (is_allowed)
+    ChildProcessSecurityPolicyImpl::GetInstance()->GrantSendMidiSysExMessage(
+        render_process_id_);
+  Send(new MidiMsg_SysExPermissionApproved(
+      render_view_id, bridge_id, is_allowed));
 }
 
 }  // namespace content