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

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

Index: chrome/browser/ui/views/profiles/user_manager_view.cc
diff --git a/chrome/browser/ui/views/profiles/user_manager_view.cc b/chrome/browser/ui/views/profiles/user_manager_view.cc
index 8f6a80ccd6a377c090e9a8801e9cf60eeee93d11..d0d5ad7f172a0b2ab14ae88d229f28e56623f0fa 100644
--- a/chrome/browser/ui/views/profiles/user_manager_view.cc
+++ b/chrome/browser/ui/views/profiles/user_manager_view.cc
@@ -13,6 +13,7 @@
 #include "chrome/browser/ui/browser_dialogs.h"
 #include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/browser_window.h"
+#include "chrome/browser/ui/user_manager.h"
 #include "chrome/browser/ui/views/auto_keep_alive.h"
 #include "chrome/grit/chromium_strings.h"
 #include "content/public/browser/web_contents.h"
@@ -38,23 +39,22 @@ const int kWindowHeight = 700;
 
 }
 
-namespace chrome {
-
-// Declared in browser_dialogs.h so others don't have to depend on this header.
-void ShowUserManager(const base::FilePath& profile_path_to_focus) {
-  UserManagerView::Show(
-      profile_path_to_focus, profiles::USER_MANAGER_NO_TUTORIAL);
-}
-
-void ShowUserManagerWithTutorial(profiles::UserManagerTutorialMode tutorial) {
-  UserManagerView::Show(base::FilePath(), tutorial);
+void UserManager::Show(
+    const base::FilePath& profile_path_to_focus,
+    profiles::UserManagerTutorialMode tutorial_mode,
+    profiles::UserManagerProfileSelected profile_open_action) {
+  UserManagerView::Show(profile_path_to_focus,
+                        tutorial_mode,
+                        profile_open_action);
 }
 
-void HideUserManager() {
+void UserManager::Hide() {
   UserManagerView::Hide();
 }
 
-}  // namespace chrome
+bool UserManager::IsShowing() {
+  return UserManagerView::IsShowing();
+}
 
 // static
 UserManagerView* UserManagerView::instance_ = NULL;
@@ -68,8 +68,10 @@ UserManagerView::~UserManagerView() {
 }
 
 // static
-void UserManagerView::Show(const base::FilePath& profile_path_to_focus,
-                           profiles::UserManagerTutorialMode tutorial_mode) {
+void UserManagerView::Show(
+    const base::FilePath& profile_path_to_focus,
+    profiles::UserManagerTutorialMode tutorial_mode,
+    profiles::UserManagerProfileSelected profile_open_action) {
   ProfileMetrics::LogProfileSwitchUser(ProfileMetrics::OPEN_USER_MANAGER);
   if (instance_) {
     // If there's a user manager window open already, just activate it.
@@ -82,6 +84,7 @@ void UserManagerView::Show(const base::FilePath& profile_path_to_focus,
   profiles::CreateGuestProfileForUserManager(
       profile_path_to_focus,
       tutorial_mode,
+      profile_open_action,
       base::Bind(&UserManagerView::OnGuestProfileCreated,
                  base::Passed(make_scoped_ptr(new UserManagerView)),
                  profile_path_to_focus));