gdata: Make WeakPtrFactory the last parameter

chrome/browser/chromeos/gdata/gdata_operation_runner.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_GDATA_GDATA_OPERATION_RUNNER_H_
 #define CHROME_BROWSER_CHROMEOS_GDATA_GDATA_OPERATION_RUNNER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 51 matching lines @@
   void RetryOperation(GDataOperationInterface* operation);
 
  private:
   // GDataAuthService::Observer override.
   virtual void OnOAuth2RefreshTokenChanged() OVERRIDE;
 
   Profile* profile_;  // not owned
 
   scoped_ptr<GDataAuthService> auth_service_;
   scoped_ptr<GDataOperationRegistry> operation_registry_;
+
+  // 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<GDataOperationRunner> weak_ptr_factory_;
-  base::WeakPtr<GDataOperationRunner> weak_ptr_bound_to_ui_thread_;
 
   DISALLOW_COPY_AND_ASSIGN(GDataOperationRunner);
 };
 
 }  // namespace gdata
 
 #endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_OPERATION_RUNNER_H_