Always load signin profile on Chrome OS startup.

chrome/browser/chromeos/profiles/profile_helper.cc

 // Copyright (c) 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/chromeos/profiles/profile_helper.h"
 
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/browsing_data/browsing_data_helper.h"
@@ skipping 101 matching lines @@
 base::FilePath ProfileHelper::GetUserProfileDir(
     const std::string& user_id_hash) {
   DCHECK(!user_id_hash.empty());
   return ShouldAddProfileDirPrefix(user_id_hash)
              ? base::FilePath(chrome::kProfileDirPrefix + user_id_hash)
              : base::FilePath(user_id_hash);
 }
 
 // static
 bool ProfileHelper::IsSigninProfile(Profile* profile) {
-  return profile->GetPath().BaseName().value() == chrome::kInitialProfile;
+  return profile &&
+         profile->GetPath().BaseName().value() == chrome::kInitialProfile;
 }
 
 // static
 bool ProfileHelper::IsOwnerProfile(Profile* profile) {
   if (!profile)
     return false;
   chromeos::UserManager* manager = chromeos::UserManager::Get();
   chromeos::User* user = manager->GetUserByProfile(profile);
   if (!user)
     return false;
@@ skipping 79 matching lines @@
 ////////////////////////////////////////////////////////////////////////////////
 // ProfileHelper, UserManager::UserSessionStateObserver implementation:
 
 void ProfileHelper::ActiveUserHashChanged(const std::string& hash) {
   active_user_id_hash_ = hash;
   base::FilePath profile_path = GetProfilePathByUserIdHash(hash);
   VLOG(1) << "Switching to profile path: " << profile_path.value();
 }
 
 }  // namespace chromeos