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

chrome/browser/ui/webui/signin/user_manager_screen_handler.h

Index: chrome/browser/ui/webui/signin/user_manager_screen_handler.h
diff --git a/chrome/browser/ui/webui/signin/user_manager_screen_handler.h b/chrome/browser/ui/webui/signin/user_manager_screen_handler.h
index 1e7d1b625537c8d860b8a6111981b36ba935b3de..fab7f7884011928b40d3062d4f823c0b26a18333 100644
--- a/chrome/browser/ui/webui/signin/user_manager_screen_handler.h
+++ b/chrome/browser/ui/webui/signin/user_manager_screen_handler.h
@@ -11,6 +11,7 @@
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
+#include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_metrics.h"
 #include "chrome/browser/signin/screenlock_bridge.h"
 #include "chrome/browser/ui/host_desktop.h"
@@ -77,6 +78,10 @@ class UserManagerScreenHandler : public content::WebUIMessageHandler,
   void ReportAuthenticationResult(bool success,
                                   ProfileMetrics::ProfileAuth metric);
 
+  // Perform cleanup once the profile and browser are open.
+  void OnSwitchToProfileComplete(Profile* profile,
+                                 Profile::CreateStatus profile_create_status);
+
   // Observes the ProfileInfoCache and gets notified when a profile has been
   // modified, so that the displayed user pods can be updated.
   scoped_ptr<ProfileUpdateObserver> profileInfoCacheObserver_;
@@ -93,6 +98,9 @@ class UserManagerScreenHandler : public content::WebUIMessageHandler,
   // Login password, held during on-line auth for saving later if correct.
   std::string password_attempt_;
 
+  // URL hash, used to key post-profile actions if present.
+  base::string16 url_hash_;
+
   typedef std::map<std::string, ScreenlockBridge::LockHandler::AuthType>
       UserAuthTypeMap;
   UserAuthTypeMap user_auth_type_map_;