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diff --git a/src/core/extensions/pdf_iframe_navigation_throttle_qt.h b/src/core/extensions/pdf_iframe_navigation_throttle_qt.h
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+++ b/src/core/extensions/pdf_iframe_navigation_throttle_qt.h
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+// Copyright (C) 2021 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
+
+// based on //chrome/browser/plugins/pdf_iframe_navigation_throttle.h
+// Copyright 2017 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 PDF_IFRAME_NAVIGATION_THROTTLE_QT
+#define PDF_IFRAME_NAVIGATION_THROTTLE_QT
+
+#include "content/public/browser/navigation_throttle.h"
+
+#include "base/memory/weak_ptr.h"
+
+namespace content {
+class NavigationHandle;
+struct WebPluginInfo;
+}
+
+namespace extensions {
+
+// This class prevents automatical download of PDFs when they are embedded
+// in subframes and plugins are disabled in API.
+class PDFIFrameNavigationThrottleQt : public content::NavigationThrottle
+{
+public:
+    static std::unique_ptr<content::NavigationThrottle> MaybeCreateThrottleFor(content::NavigationHandle *handle);
+
+    explicit PDFIFrameNavigationThrottleQt(content::NavigationHandle *handle);
+    ~PDFIFrameNavigationThrottleQt() override;
+
+    // content::NavigationThrottle
+    content::NavigationThrottle::ThrottleCheckResult WillProcessResponse() override;
+    const char *GetNameForLogging() override;
+
+private:
+    void OnPluginsLoaded(const std::vector<content::WebPluginInfo> &plugins);
+    void LoadPlaceholderHTML();
+
+    base::WeakPtrFactory<PDFIFrameNavigationThrottleQt> weak_factory_{this};
+};
+
+} // namespace extensions
+
+#endif // PDF_IFRAME_NAVIGATION_THROTTLE_QT