Fix the System Profile to not load extensions. It could otherwise be forced to by GPO.

chrome/browser/extensions/chrome_process_manager_delegate.cc

 // Copyright 2014 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.
 
 #include "chrome/browser/extensions/chrome_process_manager_delegate.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
@@ skipping 23 matching lines @@
                  content::NotificationService::AllSources());
 }
 
 ChromeProcessManagerDelegate::~ChromeProcessManagerDelegate() {
 }
 
 bool ChromeProcessManagerDelegate::IsBackgroundPageAllowed(
     content::BrowserContext* context) const {
   Profile* profile = static_cast<Profile*>(context);
 
-  bool is_normal_session = !profile->IsGuestSession();
+  bool is_normal_session = !profile->IsGuestSession() &&
+                           !profile->IsSystemProfile();
 #if defined(OS_CHROMEOS)
   is_normal_session = is_normal_session &&
                       user_manager::UserManager::Get()->IsUserLoggedIn();
 #endif
 
   // Disallow if the current session is a Guest mode session or login screen but
   // the current browser context is *not* off-the-record. Such context is
   // artificial and background page shouldn't be created in it.
   // http://crbug.com/329498
   return is_normal_session || profile->IsOffTheRecord();
@@ skipping 107 matching lines @@
     ProcessManager* incognito_manager =
         ProcessManagerFactory::GetForBrowserContextIfExists(
             profile->GetOffTheRecordProfile());
     if (incognito_manager) {
       incognito_manager->CloseBackgroundHosts();
     }
   }
 }
 
 }  // namespace extensions