Revert of Remove installation of Chrome Frame.

chrome/installer/setup/cf_migration.h

+// 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 CHROME_INSTALLER_SETUP_CF_MIGRATION_H_
+#define CHROME_INSTALLER_SETUP_CF_MIGRATION_H_
+
+#include "chrome/installer/util/util_constants.h"
+
+class CommandLine;
+
+namespace base {
+class FilePath;
+}
+
+namespace installer {
+
+class InstallationState;
+class InstallerState;
+class ProductState;
+
+// Invokes a child helper instance of the setup.exe in |installer_directory| to
+// run MigrateChromeFrame (see comments below) using the archive in
+// |installer_directory| for the given installation level. Returns true if the
+// process is launched.
+bool LaunchChromeFrameMigrationProcess(
+    const ProductState& chrome_frame_product,
+    const CommandLine& command_line,
+    const base::FilePath& installer_directory,
+    bool system_level);
+
+// Migrates multi-install Chrome Frame to single-install at the current
+// level. Does not remove the multi-install binaries if no other products are
+// using them. --uncompressed-archive=chrome.7z is expected to be given on the
+// command line to point this setup.exe at the (possibly patched) archive from
+// the calling instance.
+// Note about process model: this is called in a child setup.exe that is
+// invoked from the setup.exe instance run as part of an update to a
+// multi-install Chrome Frame.
+InstallStatus MigrateChromeFrame(const InstallationState& original_state,
+                                 InstallerState* installer_state);
+
+}  // namespace installer
+
+#endif  // CHROME_INSTALLER_SETUP_CF_MIGRATION_H_