Cleanup: Remove unneeded forward declarations in chrome/installer.

chrome/installer/setup/chrome_frame_ready_mode.h

 // Copyright (c) 2011 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.
 //
 // This file contains the specification of setup main functions.
 
 #ifndef CHROME_INSTALLER_SETUP_CHROME_FRAME_READY_MODE_H_
 #define CHROME_INSTALLER_SETUP_CHROME_FRAME_READY_MODE_H_
 #pragma once
 
-class CommandLine;
-
 namespace installer {
 
 enum InstallStatus;
 class InstallationState;
 class InstallerState;
 
 // Removes the ChromeFrameReadyMode flag from the registry, updates Chrome's
 // uninstallation commands to only uninstall Chrome, and adds an entry to the
 // Add/Remove Programs list for GCF.
 InstallStatus ChromeFrameReadyModeOptIn(const InstallationState& machine_state,
                                         const InstallerState& installer_state);
 
 // Unregisters the ChromeFrame user agent modification, sets a timestamp for
 // restoring it.
 InstallStatus ChromeFrameReadyModeTempOptOut(
     const InstallationState& machine_state,
     const InstallerState& installer_state);
 
 // Re-registers the ChromeFrame user agent modification, restores Ready Mode
 // active state flag.
 InstallStatus ChromeFrameReadyModeEndTempOptOut(
     const InstallationState& machine_state,
     const InstallerState& installer_state);
 
 }  // namespace installer
 
 #endif  // CHROME_INSTALLER_SETUP_CHROME_FRAME_READY_MODE_H_