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diff --git a/src/core/extensions/component_extension_resource_manager_qt.h b/src/core/extensions/component_extension_resource_manager_qt.h
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+++ b/src/core/extensions/component_extension_resource_manager_qt.h
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+// Copyright (C) 2018 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+// 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 COMPONENT_EXTENSION_RESOURCE_MANAGER_QT_H_
+#define COMPONENT_EXTENSION_RESOURCE_MANAGER_QT_H_
+
+#include <map>
+
+#include "base/files/file_path.h"
+#include "extensions/browser/component_extension_resource_manager.h"
+#include "ui/base/webui/resource_path.h"
+
+namespace extensions {
+
+class ComponentExtensionResourceManagerQt : public ComponentExtensionResourceManager
+{
+public:
+    ComponentExtensionResourceManagerQt();
+    ~ComponentExtensionResourceManagerQt() override;
+
+    // Overridden from ComponentExtensionResourceManager:
+    bool IsComponentExtensionResource(const base::FilePath &extension_path,
+                                      const base::FilePath &resource_path,
+                                      int *resource_id) const override;
+    const ui::TemplateReplacements *GetTemplateReplacementsForExtension(const std::string &extension_id) const override;
+
+private:
+    void AddComponentResourceEntries(const webui::ResourcePath *entries, size_t size);
+
+    // A map from a resource path to the resource ID.  Used by
+    // IsComponentExtensionResource.
+    std::map<base::FilePath, int> path_to_resource_id_;
+
+    // A map from an extension ID to its i18n template replacements.
+    std::map<std::string, ui::TemplateReplacements> template_replacements_;
+};
+
+} // namespace extensions
+
+#endif // COMPONENT_EXTENSION_RESOURCE_MANAGER_QT_H_