Remove old permission delegation prototype

third_party/WebKit/Source/core/html/HTMLIFrameElementPermissions.h

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSDstyle license that can be
-// found in the LICENSE file.
-
-#ifndef HTMLIFrameElementPermissions_h
-#define HTMLIFrameElementPermissions_h
-
-#include "core/CoreExport.h"
-#include "core/dom/DOMTokenList.h"
-#include "platform/heap/Handle.h"
-#include "public/platform/modules/permissions/permission.mojom-blink.h"
-#include "wtf/Vector.h"
-
-namespace blink {
-
-class HTMLIFrameElement;
-
-class CORE_EXPORT HTMLIFrameElementPermissions final
-    : public DOMTokenList,
-      public DOMTokenListObserver {
-  USING_GARBAGE_COLLECTED_MIXIN(HTMLIFrameElementPermissions);
-
- public:
-  static HTMLIFrameElementPermissions* create(HTMLIFrameElement* element) {
-    return new HTMLIFrameElementPermissions(element);
-  }
-
-  ~HTMLIFrameElementPermissions() override;
-
-  Vector<mojom::blink::PermissionName> parseDelegatedPermissions(
-      String& invalidTokensErrorMessage) const;
-
-  DECLARE_VIRTUAL_TRACE();
-
- private:
-  explicit HTMLIFrameElementPermissions(HTMLIFrameElement*);
-  bool validateTokenValue(const AtomicString& tokenValue,
-                          ExceptionState&) const override;
-
-  // DOMTokenListObserver.
-  void valueWasSet() override;
-
-  Member<HTMLIFrameElement> m_element;
-};
-
-}  // namespace blink
-
-#endif