Add a feature which, when enabled, blocks permissions after X prompt dismissals.

chrome/browser/permissions/permission_request_impl.h

 // Copyright 2014 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_PERMISSIONS_PERMISSION_REQUEST_IMPL_H_
 #define CHROME_BROWSER_PERMISSIONS_PERMISSION_REQUEST_IMPL_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "chrome/browser/permissions/permission_request.h"
 #include "chrome/browser/permissions/permission_request_id.h"
 #include "components/content_settings/core/common/content_settings.h"
 #include "content/public/browser/permission_type.h"
 
 class GURL;
-class PermissionContextBase;
 class Profile;
 
 // Default implementation of PermissionRequest, it is assumed that the
 // caller owns it and that it can be deleted once the |delete_callback|
 // is executed.
 class PermissionRequestImpl : public PermissionRequest {
  public:
   using PermissionDecidedCallback = base::Callback<void(bool, ContentSetting)>;
 
   PermissionRequestImpl(
@@ skipping 35 matching lines @@
   // Called when the request is no longer in use so it can be deleted by the
   // caller.
   const base::Closure delete_callback_;
   bool is_finished_;
   bool action_taken_;
 
   DISALLOW_COPY_AND_ASSIGN(PermissionRequestImpl);
 };
 
 #endif  // CHROME_BROWSER_PERMISSIONS_PERMISSION_REQUEST_IMPL_H_