Fix crash when locking a profile.

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 "chrome/browser/browser_process.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_dialogs.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/user_metrics.h"
 
 #if !defined(OS_IOS)
 #include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/browser_list_observer.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/startup/startup_browser_creator.h"
 #endif  // !defined (OS_IOS)
@@ skipping 146 matching lines @@
 void CloseGuestProfileWindows() {
   ProfileManager* profile_manager = g_browser_process->profile_manager();
   Profile* profile = profile_manager->GetProfileByPath(
       ProfileManager::GetGuestProfilePath());
 
   if (profile) {
     BrowserList::CloseAllBrowsersWithProfile(profile);
   }
 }
 
+void LockProfile(Profile* profile) {
+  DCHECK(profile);
+  ProfileInfoCache& cache =
+      g_browser_process->profile_manager()->GetProfileInfoCache();
+
+  size_t index = cache.GetIndexOfProfileWithPath(profile->GetPath());
+  cache.SetProfileSigninRequiredAtIndex(index, true);
+  chrome::ShowUserManager(profile->GetPath());
+  BrowserList::CloseAllBrowsersWithProfile(profile);
+}
+
 }  // namespace profiles