Use username_hash instead of email

chrome/browser/chromeos/extensions/wallpaper_private_api.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_EXTENSIONS_WALLPAPER_PRIVATE_API_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_WALLPAPER_PRIVATE_API_H_
 
 #include "ash/desktop_background/desktop_background_controller.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "chrome/browser/chromeos/extensions/wallpaper_function_base.h"
@@ skipping 144 matching lines @@
 
   // True if need to generate thumbnail and pass to callback.
   bool generate_thumbnail_;
 
   // Unique file name of the custom wallpaper.
   std::string file_name_;
 
   // Email address of logged in user.
   std::string email_;
 
+  // User id hash of the logged in user.
+  std::string user_id_hash_;
+
   // String representation of downloaded wallpaper.
   std::string image_data_;
 
   // Sequence token associated with wallpaper operations. Shared with
   // WallpaperManager.
   base::SequencedWorkerPool::SequenceToken sequence_token_;
 };
 
 class WallpaperPrivateSetCustomWallpaperLayoutFunction
     : public AsyncExtensionFunction {
@@ skipping 121 matching lines @@
   // Sends the list of files to extension api caller. If no files or no
   // directory, sends empty list.
   void OnComplete(const std::vector<std::string>& file_list);
 
   // Sequence token associated with wallpaper operations. Shared with
   // WallpaperManager.
   base::SequencedWorkerPool::SequenceToken sequence_token_;
 };
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_WALLPAPER_PRIVATE_API_H_