Fix the System Profile with extensions.

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 366 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 144 matching lines @@
   PrefService* local_state = g_browser_process->local_state();
   const bool dismissed = local_state->GetBoolean(
       prefs::kProfileAvatarRightClickTutorialDismissed);
 
   // Don't show the tutorial if it's already been dismissed or if right-clicking
   // wouldn't show any targets.
   return !dismissed && HasProfileSwitchTargets(profile);
 }
 
 }  // namespace profiles