This CL replaces e-mail with AccountId in wallpaper manager code.

chrome/browser/chromeos/background/ash_user_wallpaper_delegate.cc

Index: chrome/browser/chromeos/background/ash_user_wallpaper_delegate.cc
diff --git a/chrome/browser/chromeos/background/ash_user_wallpaper_delegate.cc b/chrome/browser/chromeos/background/ash_user_wallpaper_delegate.cc
index 10dd3e1527937329e9c78a5d67182cd47d9ca6b3..8fb24246ea41c0d9fbeae5e82808fe1833b8a996 100644
--- a/chrome/browser/chromeos/background/ash_user_wallpaper_delegate.cc
+++ b/chrome/browser/chromeos/background/ash_user_wallpaper_delegate.cc
@@ -109,7 +109,8 @@ class UserWallpaperDelegate : public ash::UserWallpaperDelegate {
         user_manager::UserManager::Get()->GetActiveUser();
     if (!user)
       return false;
-    if (chromeos::WallpaperManager::Get()->IsPolicyControlled(user->email()))
+    if (chromeos::WallpaperManager::Get()->IsPolicyControlled(
+            user->GetAccountId()))
       return false;
     return true;
   }