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diff --git a/src/core/common/extensions/extensions_client_qt.h b/src/core/common/extensions/extensions_client_qt.h
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+++ b/src/core/common/extensions/extensions_client_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
+
+// Portions copyright 2013 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 EXTENSIONS_CLIENT_QT_H
+#define EXTENSIONS_CLIENT_QT_H
+
+#include "extensions/common/extensions_client.h"
+
+#include "base/lazy_instance.h"
+#include "chrome/common/extensions/permissions/chrome_permission_message_provider.h"
+#include "extensions/common/features/feature_provider.h"
+#include "extensions/common/features/json_feature_provider_source.h"
+#include "extensions/common/permissions/extensions_api_permissions.h"
+#include "url/gurl.h"
+
+namespace extensions {
+
+// Sets up global state for the extensions system. Should be Set() once in each
+// process. This should be implemented by the client of the extensions system.
+class ExtensionsClientQt : public ExtensionsClient
+{
+public:
+    ExtensionsClientQt();
+    virtual ~ExtensionsClientQt() {}
+
+    // Initializes global state. Not done in the constructor because unit tests
+    // can create additional ExtensionsClients because the utility thread runs
+    // in-process.
+    void Initialize() override;
+    void InitializeWebStoreUrls(base::CommandLine *command_line) override;
+
+    // Returns the global PermissionMessageProvider to use to provide permission
+    // warning strings.
+    const PermissionMessageProvider &GetPermissionMessageProvider() const override;
+
+    // Returns the application name. For example, "Chromium" or "app_shell".
+    const std::string GetProductName() override;
+
+    // Takes the list of all hosts and filters out those with special
+    // permission strings. Adds the regular hosts to |new_hosts|,
+    // and adds any additional permissions to |permissions|.
+    // TODO(sashab): Split this function in two: One to filter out ignored host
+    // permissions, and one to get permissions for the given hosts.
+    void FilterHostPermissions(const URLPatternSet &hosts,
+                               URLPatternSet *new_hosts,
+                               PermissionIDSet *permissions) const override;
+
+    // Replaces the scripting allowlist with |allowlist|. Used in the renderer;
+    // only used for testing in the browser process.
+    void SetScriptingAllowlist(const ScriptingAllowlist &allowlist) override;
+
+    // Return the allowlist of extensions that can run content scripts on
+    // any origin.
+    const ScriptingAllowlist &GetScriptingAllowlist() const override;
+
+    // Get the set of chrome:// hosts that |extension| can run content scripts on.
+    URLPatternSet GetPermittedChromeSchemeHosts(const Extension *extension,
+                                                const APIPermissionSet &api_permissions) const override;
+
+    // Returns false if content scripts are forbidden from running on |url|.
+    bool IsScriptableURL(const GURL &url, std::string *error) const override;
+
+    // Returns the base webstore URL prefix.
+    const GURL &GetWebstoreBaseURL() const override;
+
+    // Returns the URL to use for update manifest queries.
+    const GURL &GetWebstoreUpdateURL() const override;
+
+    // Returns a flag indicating whether or not a given URL is a valid
+    // extension blacklist URL.
+    bool IsBlocklistUpdateURL(const GURL &url) const override;
+
+    const GURL &GetNewWebstoreBaseURL() const override;
+
+    // Returns the set of file paths corresponding to any images within an
+    // extension's contents that may be displayed directly within the browser UI
+    // or WebUI, such as icons or theme images. This set of paths is used by the
+    // extension unpacker to determine which assets should be transcoded safely
+    // within the utility sandbox.
+    //
+    // The default implementation returns the images used as icons for the
+    // extension itself, so implementors of ExtensionsClient overriding this may
+    // want to call the base class version and then add additional paths to that
+    // result.
+    std::set<base::FilePath> GetBrowserImagePaths(const Extension *extension) override;
+    // Get the LazyInstance for ChromeExtensionsClient.
+    static ExtensionsClientQt *GetInstance();
+
+private:
+    ScriptingAllowlist scripting_allowlist_;
+    const ChromePermissionMessageProvider permission_message_provider_;
+    mutable GURL update_url_;
+    mutable GURL base_url_;
+};
+
+} // namespace extensions
+
+#endif // EXTENSIONS_CLIENT_QT_H