Move User Manager onto a System profile.

chrome/browser/profiles/profiles_state.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/profiles_state.h"
 
 #include "base/files/file_path.h"
 #include "base/prefs/pref_registry_simple.h"
 #include "base/prefs/pref_service.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 166 matching lines @@
 
   if (active_profile->IsGuestSession())
     return active_profile;
 
   ProfileManager* profile_manager = g_browser_process->profile_manager();
   const ProfileInfoCache& cache = profile_manager->GetProfileInfoCache();
   size_t index = cache.GetIndexOfProfileWithPath(active_profile->GetPath());
   if (!cache.ProfileIsSigninRequiredAtIndex(index))
     return NULL;
 
-  // The guest profile must have been loaded already.
+  // Profile loads synchronously if it was not previously created.
   Profile* guest_profile = profile_manager->GetProfile(
       ProfileManager::GetGuestProfilePath());
   DCHECK(guest_profile);
 
   PrefService* local_state = g_browser_process->local_state();
   DCHECK(local_state);
   local_state->SetString(prefs::kProfileLastUsed,
                          guest_profile->GetPath().BaseName().MaybeAsASCII());
   return guest_profile;
 }
 
 }  // namespace profiles