Ensure media permission requests are correctly cancelled when permission prompts are ignored

chrome/browser/media/webrtc/media_stream_device_permission_context.h

 // Copyright 2015 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_WEBRTC_MEDIA_STREAM_DEVICE_PERMISSION_CONTEXT_H_
 #define CHROME_BROWSER_MEDIA_WEBRTC_MEDIA_STREAM_DEVICE_PERMISSION_CONTEXT_H_
 
 #include "base/macros.h"
 #include "chrome/browser/permissions/permission_context_base.h"
 #include "components/content_settings/core/common/content_settings_types.h"
@@ skipping 16 matching lines @@
   // TODO(xhwang): GURL.GetOrigin() shouldn't be used as the origin. Need to
   // refactor to use url::Origin. crbug.com/527149 is filed for this.
   ContentSetting GetPermissionStatusInternal(
       content::RenderFrameHost* render_frame_host,
       const GURL& requesting_origin,
       const GURL& embedding_origin) const override;
 
   void ResetPermission(const GURL& requesting_origin,
                        const GURL& embedding_origin) override;
 
-  void CancelPermissionRequest(content::WebContents* web_contents,
-                               const PermissionRequestID& id) override;
-
  private:
   // PermissionContextBase:
   bool IsRestrictedToSecureOrigins() const override;
 
   ContentSettingsType content_settings_type_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaStreamDevicePermissionContext);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_WEBRTC_MEDIA_STREAM_DEVICE_PERMISSION_CONTEXT_H_