Revert 149576 - gdata: Make WeakPtrFactory the last parameter

chrome/browser/chromeos/gdata/gdata_auth_service.h

Index: chrome/browser/chromeos/gdata/gdata_auth_service.h
===================================================================
--- chrome/browser/chromeos/gdata/gdata_auth_service.h	(revision 149581)
+++ chrome/browser/chromeos/gdata/gdata_auth_service.h	(working copy)
@@ -98,10 +98,8 @@
   ObserverList<Observer> observers_;
 
   content::NotificationRegistrar registrar_;
-
-  // Note: This should remain the last member so it'll be destroyed and
-  // invalidate its weak pointers before any other members are destroyed.
   base::WeakPtrFactory<GDataAuthService> weak_ptr_factory_;
+  base::WeakPtr<GDataAuthService> weak_ptr_bound_to_ui_thread_;
 
   DISALLOW_COPY_AND_ASSIGN(GDataAuthService);
 };