MidiPermissionContext::GetPermission() returns BLOCK for insecure origins.

chrome/browser/media/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_MIDI_PERMISSION_CONTEXT_H_
 #define CHROME_BROWSER_MEDIA_MIDI_PERMISSION_CONTEXT_H_
 
 #include "chrome/browser/content_settings/permission_context_base.h"
 
 class GURL;
 class PermissionRequestID;
 
 class MidiPermissionContext : public PermissionContextBase {
  public:
   explicit MidiPermissionContext(Profile* profile);
   ~MidiPermissionContext() override;
 
+  // PermissionContextBase:
+  ContentSetting GetPermissionStatus(
+      const GURL& requesting_origin,
+      const GURL& embedding_origin) const override;
+  void DecidePermission(content::WebContents* web_contents,

[ddorwin, 2015/05/22 16:18:59]

Should be protected like the parent class?

[mlamouri (slow - plz ping), 2015/05/22 18:16:00]

Done.

+                        const PermissionRequestID& id,
+                        const GURL& requesting_origin,
+                        const GURL& embedding_origin,
+                        bool user_gesture,
+                        const BrowserPermissionCallback& callback) override;
+
  private:
-
   // PermissionContextBase:
   void UpdateTabContext(const PermissionRequestID& id,
                         const GURL& requesting_frame,
                         bool allowed) override;
 
   DISALLOW_COPY_AND_ASSIGN(MidiPermissionContext);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_MIDI_PERMISSION_CONTEXT_H_