Revert 149576 - gdata: Make WeakPtrFactory the last parameter

chrome/browser/chromeos/gdata/gdata_download_observer.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_DOWNLOAD_OBSERVER_H_
-#define CHROME_BROWSER_CHROMEOS_GDATA_GDATA_DOWNLOAD_OBSERVER_H_
+#ifndef CHROME_BROWSER_CHROMEOS_GDATA_GDATA_DOWNLOAD_OBSERVER_H__
+#define CHROME_BROWSER_CHROMEOS_GDATA_GDATA_DOWNLOAD_OBSERVER_H__
 
 #include <map>
 
 #include "base/callback.h"
 #include "base/memory/weak_ptr.h"
 #include "base/platform_file.h"
 #include "content/public/browser/download_item.h"
 #include "content/public/browser/download_manager.h"
 #include "chrome/browser/chromeos/gdata/gdata_errorcode.h"
 
@@ skipping 131 matching lines @@
   // Observe the DownloadManager for new downloads.
   content::DownloadManager* download_manager_;
 
   // Temporary download location directory.
   FilePath gdata_tmp_download_path_;
 
   // Map of pending downloads.
   typedef std::map<int32, content::DownloadItem*> DownloadMap;
   DownloadMap pending_downloads_;
 
-  // 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<GDataDownloadObserver> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GDataDownloadObserver);
 };
 
 }  // namespace gdata
 
-#endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_DOWNLOAD_OBSERVER_H_
+#endif  // CHROME_BROWSER_CHROMEOS_GDATA_GDATA_DOWNLOAD_OBSERVER_H__