Nicely handle OnBeforeUnloads with guest and lock mode.

chrome/browser/ui/views/profiles/profile_chooser_view.cc

 // Copyright 2014 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/ui/views/profiles/profile_chooser_view.h"
 
 #include "base/prefs/pref_service.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
@@ skipping 687 matching lines @@
 
 void ProfileChooserView::ButtonPressed(views::Button* sender,
                                        const ui::Event& event) {
   // Disable button after clicking so that it doesn't get clicked twice and
   // start a second action... which can crash Chrome.  But don't disable if it
   // has no parent (like in tests) because that will also crash.
   if (sender->parent())
     sender->SetEnabled(false);
 
   if (sender == users_button_) {
-    // If this is a guest session, also close all the guest browser windows.
-    if (browser_->profile()->IsGuestSession()) {
-      chrome::ShowUserManager(base::FilePath());
+    // If this is a guest session, close all the guest browser windows.
+    if (browser_->profile()->IsGuestSession())
       profiles::CloseGuestProfileWindows();
-    } else {
+    else
       chrome::ShowUserManager(browser_->profile()->GetPath());
-    }
     PostActionPerformed(ProfileMetrics::PROFILE_DESKTOP_MENU_OPEN_USER_MANAGER);
   } else if (sender == go_incognito_button_) {
     DCHECK(ShouldShowGoIncognito());
     chrome::NewIncognitoWindow(browser_);
   } else if (sender == lock_button_) {
     profiles::LockProfile(browser_->profile());
     PostActionPerformed(ProfileMetrics::PROFILE_DESKTOP_MENU_LOCK);
   } else if (sender == auth_error_email_button_) {
     ShowView(profiles::BUBBLE_VIEW_MODE_GAIA_REAUTH, avatar_menu_.get());
   } else if (sender == tutorial_sync_settings_ok_button_) {
@@ skipping 910 matching lines @@
       IncognitoModePrefs::GetAvailability(browser_->profile()->GetPrefs()) !=
           IncognitoModePrefs::DISABLED;
   return incognito_available && !browser_->profile()->IsGuestSession();
 }
 
 void ProfileChooserView::PostActionPerformed(
     ProfileMetrics::ProfileDesktopMenu action_performed) {
   ProfileMetrics::LogProfileDesktopMenu(action_performed, gaia_service_type_);
   gaia_service_type_ = signin::GAIA_SERVICE_TYPE_NONE;
 }