Avoid a crash in ProfileManager::GetLastUsedProfileAllowedByPolicy()

chrome/browser/profiles/profile_manager.cc

 // Copyright (c) 2012 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_manager.h"
 
 #include <stdint.h>
 
 #include <map>
 #include <set>
@@ skipping 353 matching lines @@
 
 // static
 Profile* ProfileManager::GetLastUsedProfile() {
   ProfileManager* profile_manager = g_browser_process->profile_manager();
   return profile_manager->GetLastUsedProfile(profile_manager->user_data_dir_);
 }
 
 // static
 Profile* ProfileManager::GetLastUsedProfileAllowedByPolicy() {
   Profile* profile = GetLastUsedProfile();
+  if (!profile)
+    return nullptr;
   if (IncognitoModeForced(profile))
     return profile->GetOffTheRecordProfile();
   return profile;
 }
 
 // static
 bool ProfileManager::IncognitoModeForced(Profile* profile) {
   return profile->IsGuestSession() ||
          profile->IsSystemProfile() ||
          IncognitoModePrefs::GetAvailability(profile->GetPrefs()) ==
@@ skipping 1263 matching lines @@
 
   FinishDeletingProfile(profile_to_delete_path, new_active_profile_path);
   if (!original_callback.is_null())
     original_callback.Run(loaded_profile, status);
 }
 #endif  // !defined(OS_ANDROID)
 
 ProfileManagerWithoutInit::ProfileManagerWithoutInit(
     const base::FilePath& user_data_dir) : ProfileManager(user_data_dir) {
 }