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

chrome/browser/ui/ash/multi_user/user_switch_animator_chromeos.cc

Index: chrome/browser/ui/ash/multi_user/user_switch_animator_chromeos.cc
diff --git a/chrome/browser/ui/ash/multi_user/user_switch_animator_chromeos.cc b/chrome/browser/ui/ash/multi_user/user_switch_animator_chromeos.cc
index 4f194dded2f4ad1395972bd8afe21af460429176..e9fdcdb6ea364071acccf81044e93665ce69081c 100644
--- a/chrome/browser/ui/ash/multi_user/user_switch_animator_chromeos.cc
+++ b/chrome/browser/ui/ash/multi_user/user_switch_animator_chromeos.cc
@@ -193,22 +193,20 @@ void UserSwitchAnimatorChromeOS::TransitionWallpaper(
     wallpaper_delegate->SetAnimationDurationOverride(
         std::max(duration, kMinimalAnimationTimeMS));
     if (screen_cover_ != NEW_USER_COVERS_SCREEN) {
-      chromeos::WallpaperManager::Get()->SetUserWallpaperNow(
-          new_account_id_.GetUserEmail());
+      chromeos::WallpaperManager::Get()->SetUserWallpaperNow(new_account_id_);
       wallpaper_user_id_for_test_ =
           (NO_USER_COVERS_SCREEN == screen_cover_ ? "->" : "") +
-          new_account_id_.GetUserEmail();
+          new_account_id_.Serialize();
     }
   } else if (animation_step == ANIMATION_STEP_FINALIZE) {
     // Revert the wallpaper cross dissolve animation duration back to the
     // default.
     if (screen_cover_ == NEW_USER_COVERS_SCREEN)
-      chromeos::WallpaperManager::Get()->SetUserWallpaperNow(
-          new_account_id_.GetUserEmail());
+      chromeos::WallpaperManager::Get()->SetUserWallpaperNow(new_account_id_);
 
     // Coming here the wallpaper user id is the final result. No matter how we
     // got here.
-    wallpaper_user_id_for_test_ = new_account_id_.GetUserEmail();
+    wallpaper_user_id_for_test_ = new_account_id_.Serialize();
     wallpaper_delegate->SetAnimationDurationOverride(0);
   }
 }