Add way for PermissionContext to be automatically restricted to secure 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;
-
  private:
   // PermissionContextBase:
   void UpdateTabContext(const PermissionRequestID& id,
                         const GURL& requesting_frame,
                         bool allowed) override;
-  void DecidePermission(content::WebContents* web_contents,
-                        const PermissionRequestID& id,
-                        const GURL& requesting_origin,
-                        const GURL& embedding_origin,
-                        bool user_gesture,
-                        const BrowserPermissionCallback& callback) override;
+  bool RestrictToSecureOrigins() const override;
 
   DISALLOW_COPY_AND_ASSIGN(MidiPermissionContext);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_MIDI_PERMISSION_CONTEXT_H_