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

chrome/browser/profiles/profile_window.cc

 // 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.
 
 #include "chrome/browser/profiles/profile_window.h"
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/string_number_conversions.h"
@@ skipping 365 matching lines @@
     BrowserList::CloseAllBrowsersWithProfile(
         profile, base::Bind(&LockBrowserCloseSuccess));
   }
 }
 
 bool IsLockAvailable(Profile* profile) {
   DCHECK(profile);
   if (!switches::IsNewProfileManagement())
     return false;
 
-  if (profile->IsGuestSession())
+  if (profile->IsGuestSession() || profile->IsSystemProfile())
     return false;
 
   std::string hosted_domain = profile->GetPrefs()->
       GetString(prefs::kGoogleServicesHostedDomain);
   // TODO(mlerman): After one release remove any hosted_domain reference to the
   // pref, since all users will have this in the AccountTrackerService.
   if (hosted_domain.empty()) {
     AccountTrackerService* account_tracker =
         AccountTrackerServiceFactory::GetForProfile(profile);
     std::string account_id =
@@ skipping 122 matching lines @@
       return;
     case BrowserWindow::AVATAR_BUBBLE_MODE_FAST_USER_SWITCH:
       *bubble_view_mode = profiles::BUBBLE_VIEW_MODE_FAST_PROFILE_CHOOSER;
       return;
     default:
       *bubble_view_mode = profiles::BUBBLE_VIEW_MODE_PROFILE_CHOOSER;
   }
 }
 
 }  // namespace profiles