Make the auto-launch experiment profile-aware.

chrome/browser/ui/webui/options2/browser_options_handler2.h

Index: chrome/browser/ui/webui/options2/browser_options_handler2.h
===================================================================
--- chrome/browser/ui/webui/options2/browser_options_handler2.h	(revision 119922)
+++ chrome/browser/ui/webui/options2/browser_options_handler2.h	(working copy)
@@ -82,8 +82,9 @@
   // thread (see CheckAutoLaunchCallback). A weak pointer to this is passed in
   // as a parameter to avoid the need to lock between this function and the
   // destructor.
+  void CheckAutoLaunch(base::WeakPtr<BrowserOptionsHandler> weak_this,
+                       const FilePath& profile_path);
 
-  void CheckAutoLaunch(base::WeakPtr<BrowserOptionsHandler> weak_this);
   // Sets up (on the UI thread) the necessary bindings for toggling auto-launch
   // (if the user is part of the auto-launch and makes sure the HTML UI knows
   // whether Chrome will auto-launch at login.