Use username_hash instead of email

chrome/browser/chromeos/extensions/wallpaper_api.h

 // Copyright 2013 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_API_H_
 #define CHROME_BROWSER_CHROMEOS_EXTENSIONS_WALLPAPER_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"
 
 // Implementation of chrome.wallpaper.setWallpaper API.
 // After this API being called, a jpeg encoded wallpaper will be saved to
-// /home/chronos/custom_wallpaper/{resolution}/{username}/file_name. The
+// /home/chronos/custom_wallpaper/{resolution}/{user_id_hash}/file_name. The
 // wallpaper can then persistent after Chrome restart. New call to this API
 // will replace the previous saved wallpaper with new one.
 // Note: For security reason, the original encoded wallpaper image is not saved
 // directly. It is decoded and re-encoded to jpeg format before saved to file
 // system.
 class WallpaperSetWallpaperFunction : public WallpaperFunctionBase {
  public:
   DECLARE_EXTENSION_FUNCTION("wallpaper.setWallpaper",
                              WALLPAPER_SETWALLPAPER)
 
@@ skipping 19 matching lines @@
   // Layout of the downloaded wallpaper.
   ash::WallpaperLayout layout_;
 
   // 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.
-  // TODO(bshe): User's email should not be used as part of wallpaper file path.
-  // http://crbug.com/287020
   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_;
 };
 
 #endif  // CHROME_BROWSER_CHROMEOS_EXTENSIONS_WALLPAPER_API_H_