Access to Chrome via the System Tray should go through the User Manager.

chrome/browser/ui/cocoa/profiles/profile_chooser_controller.mm

 // 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.
 
 #import <Cocoa/Cocoa.h>
 
 #import "chrome/browser/ui/cocoa/profiles/profile_chooser_controller.h"
 
 #include "base/mac/bundle_locations.h"
 #include "base/prefs/pref_service.h"
@@ skipping 12 matching lines @@
 #include "chrome/browser/profiles/profile_window.h"
 #include "chrome/browser/profiles/profiles_state.h"
 #include "chrome/browser/signin/local_auth.h"
 #include "chrome/browser/signin/profile_oauth2_token_service_factory.h"
 #include "chrome/browser/signin/signin_header_helper.h"
 #include "chrome/browser/signin/signin_manager_factory.h"
 #include "chrome/browser/signin/signin_promo.h"
 #include "chrome/browser/signin/signin_ui_util.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_commands.h"
-#include "chrome/browser/ui/browser_dialogs.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/chrome_pages.h"
 #include "chrome/browser/ui/chrome_style.h"
+#include "chrome/browser/ui/user_manager.h"
 #import "chrome/browser/ui/cocoa/hyperlink_text_view.h"
 #import "chrome/browser/ui/cocoa/info_bubble_view.h"
 #import "chrome/browser/ui/cocoa/info_bubble_window.h"
 #import "chrome/browser/ui/cocoa/profiles/user_manager_mac.h"
 #include "chrome/browser/ui/singleton_tabs.h"
 #include "chrome/browser/ui/webui/signin/login_ui_service.h"
 #include "chrome/browser/ui/webui/signin/login_ui_service_factory.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/grit/chromium_strings.h"
@@ skipping 841 matching lines @@
 
 - (IBAction)switchToProfile:(id)sender {
   // Check the event flags to see if a new window should be created.
   bool alwaysCreate = ui::WindowOpenDispositionFromNSEvent(
       [NSApp currentEvent]) == NEW_WINDOW;
   avatarMenu_->SwitchToProfile([sender tag], alwaysCreate,
                                ProfileMetrics::SWITCH_PROFILE_ICON);
 }
 
 - (IBAction)showUserManager:(id)sender {
-  chrome::ShowUserManager(base::FilePath());
+  UserManager::Show(base::FilePath(),
+                    profiles::USER_MANAGER_NO_TUTORIAL,
+                    profiles::USER_MANAGER_SELECT_PROFILE_NO_ACTION);
   [self postActionPerformed:
       ProfileMetrics::PROFILE_DESKTOP_MENU_OPEN_USER_MANAGER];
 }
 
 - (IBAction)exitGuest:(id)sender {
   DCHECK(browser_->profile()->IsGuestSession());
-  chrome::ShowUserManager(base::FilePath());
+  UserManager::Show(base::FilePath(),
+                  profiles::USER_MANAGER_NO_TUTORIAL,

[Alexei Svitkine (slow), 2014/09/18 20:54:04]

Nit: Align.

[Mike Lerman, 2014/09/19 15:49:30]

Done.

+                  profiles::USER_MANAGER_SELECT_PROFILE_NO_ACTION);
   profiles::CloseGuestProfileWindows();
 }
 
 - (IBAction)goIncognito:(id)sender {
   DCHECK([self shouldShowGoIncognito]);
   chrome::NewIncognitoWindow(browser_);
 }
 
 - (IBAction)showAccountManagement:(id)sender {
   [self initMenuContentsWithView:profiles::BUBBLE_VIEW_MODE_ACCOUNT_MANAGEMENT];
@@ skipping 53 matching lines @@
   DCHECK(!accountIdToRemove_.empty());
   ProfileOAuth2TokenServiceFactory::GetPlatformSpecificForProfile(
       browser_->profile())->RevokeCredentials(accountIdToRemove_);
   [self postActionPerformed:ProfileMetrics::PROFILE_DESKTOP_MENU_REMOVE_ACCT];
   accountIdToRemove_.clear();
 
   [self initMenuContentsWithView:profiles::BUBBLE_VIEW_MODE_ACCOUNT_MANAGEMENT];
 }
 
 - (IBAction)seeWhatsNew:(id)sender {
-  chrome::ShowUserManagerWithTutorial(
-      profiles::USER_MANAGER_TUTORIAL_OVERVIEW);
+  UserManager::Show(base::FilePath(),
+                    profiles::USER_MANAGER_TUTORIAL_OVERVIEW,
+                    profiles::USER_MANAGER_SELECT_PROFILE_NO_ACTION);
   ProfileMetrics::LogProfileNewAvatarMenuUpgrade(
       ProfileMetrics::PROFILE_AVATAR_MENU_UPGRADE_WHATS_NEW);
 }
 
 - (IBAction)showSwitchUserView:(id)sender {
   [self initMenuContentsWithView:profiles::BUBBLE_VIEW_MODE_SWITCH_USER];
   ProfileMetrics::LogProfileNewAvatarMenuUpgrade(
       ProfileMetrics::PROFILE_AVATAR_MENU_UPGRADE_NOT_YOU);
 }
 
@@ skipping 1186 matching lines @@
 }
 
 - (bool)shouldShowGoIncognito {
   bool incognitoAvailable =
       IncognitoModePrefs::GetAvailability(browser_->profile()->GetPrefs()) !=
           IncognitoModePrefs::DISABLED;
   return incognitoAvailable && !browser_->profile()->IsGuestSession();
 }
 
 @end