Remove old permission delegation prototype

chrome/browser/permissions/delegation_tracker.h

-// Copyright 2016 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_DELEGATION_TRACKER_H_
-#define CHROME_BROWSER_PERMISSIONS_DELEGATION_TRACKER_H_
-
-#include <memory>
-#include <unordered_map>
-#include <vector>
-
-#include "base/macros.h"
-#include "components/content_settings/core/common/content_settings_types.h"
-
-namespace content {
-
-class RenderFrameHost;
-
-}  // namespace content
-
-// Keeps track of which permissions are delegated to frames. There are two
-// operations possible:
-// 1) Setting the permissions which are delegated to a frame by its parent, and
-// 2) Querying whether a particular permission is granted to a frame.
-//
-// If a frame is destroyed or navigated, permissions will no longer be delegated
-// to it.
-class DelegationTracker {
- public:
-  DelegationTracker();
-  ~DelegationTracker();
-
-  // Set the |permissions| which are delegated to |child_rfh| by its parent.
-  void SetDelegatedPermissions(
-      content::RenderFrameHost* child_rfh,
-      const std::vector<ContentSettingsType>& permissions);
-
-  // Query whether |permission| is granted to |requesting_rfh|. This will return
-  // true if |requesting_rfh| is a top-level frame or if it has been delegated
-  // |permission| through its ancestor frames. Specifically, each frame on the
-  // path between the main frame and |requesting_rfh| must either delegate
-  // |permission| to it's child OR have the same origin as it's child on that
-  // path in order for this to return true.
-  bool IsGranted(content::RenderFrameHost* requesting_rfh,
-                 ContentSettingsType permission);
-
- private:
-  class DelegatedForChild;
-
-  void RenderFrameHostChanged(content::RenderFrameHost* rfh);
-
-  std::unordered_map<content::RenderFrameHost*,
-                     std::unique_ptr<DelegatedForChild>>
-      delegated_permissions_;
-
-  DISALLOW_COPY_AND_ASSIGN(DelegationTracker);
-};
-
-#endif  // CHROME_BROWSER_PERMISSIONS_DELEGATION_TRACKER_H_