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

chrome/browser/chromeos/chrome_browser_main_chromeos.cc

Index: chrome/browser/chromeos/chrome_browser_main_chromeos.cc
===================================================================
--- chrome/browser/chromeos/chrome_browser_main_chromeos.cc	(revision 162209)
+++ chrome/browser/chromeos/chrome_browser_main_chromeos.cc	(working copy)
@@ -17,7 +17,6 @@
 #include "base/string_number_conversions.h"
 #include "base/string_split.h"
 #include "chrome/browser/browser_process.h"
-#include "chrome/browser/chromeos/accessibility/magnification_manager.h"
 #include "chrome/browser/chromeos/audio/audio_handler.h"
 #include "chrome/browser/chromeos/boot_times_loader.h"
 #include "chrome/browser/chromeos/contacts/contact_manager.h"
@@ -459,8 +458,6 @@
     power_state_override_.reset(new chromeos::PowerStateOverride(
         chromeos::PowerStateOverride::BLOCK_DISPLAY_SLEEP));
   }
-  magnification_manager_.reset(
-      chromeos::MagnificationManager::CreateInstance());
 
   primary_display_switch_observer_.reset(
       new chromeos::PrimaryDisplaySwitchObserver());
@@ -545,7 +542,6 @@
   brightness_observer_.reset();
   output_observer_.reset();
   power_state_override_.reset();
-  magnification_manager_.reset();
 
   // The XInput2 event listener needs to be shut down earlier than when
   // Singletons are finally destroyed in AtExitManager.