Reverting this CL because it was committed before I gave the final LGTM.

chrome/browser/chromeos/chrome_browser_main_chromeos.h

 // Copyright (c) 2012 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_BROWSER_CHROMEOS_CHROME_BROWSER_MAIN_CHROMEOS_H_
 #define CHROME_BROWSER_CHROMEOS_CHROME_BROWSER_MAIN_CHROMEOS_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/chrome_browser_main_linux.h"
 
 namespace chromeos {
 class BrightnessObserver;
-class MagnificationManager;
 class OutputObserver;
 class PowerButtonObserver;
 class PowerStateOverride;
 class PrimaryDisplaySwitchObserver;
 class RemovableDeviceNotificationsCros;
 class ResumeObserver;
 class ScreenDimmingObserver;
 class ScreenLockObserver;
 class SessionManagerObserver;
 class UserActivityNotifier;
@@ skipping 37 matching lines @@
   scoped_ptr<chromeos::ScreenLockObserver> screen_lock_observer_;
   scoped_ptr<chromeos::PowerButtonObserver> power_button_observer_;
   scoped_ptr<chromeos::PowerStateOverride> power_state_override_;
   scoped_ptr<chromeos::PrimaryDisplaySwitchObserver>
       primary_display_switch_observer_;
   scoped_ptr<chromeos::UserActivityNotifier> user_activity_notifier_;
   scoped_ptr<chromeos::VideoActivityNotifier> video_activity_notifier_;
   scoped_ptr<chromeos::ScreenDimmingObserver> screen_dimming_observer_;
   scoped_refptr<chromeos::RemovableDeviceNotificationsCros>
       removable_device_notifications_;
-  scoped_ptr<chromeos::MagnificationManager> magnification_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserMainPartsChromeos);
 };
 
 #endif  // CHROME_BROWSER_CHROMEOS_CHROME_BROWSER_MAIN_CHROMEOS_H_