ash: HiDPI user avatar for SessionController

ash/common/system/user/tray_user.cc

Index: ash/common/system/user/tray_user.cc
diff --git a/ash/common/system/user/tray_user.cc b/ash/common/system/user/tray_user.cc
index c9035d3d84db5730af29909b682303fe25c0583a..8c5e36ac757f034013e476a7041ecb3261c08d3a 100644
--- a/ash/common/system/user/tray_user.cc
+++ b/ash/common/system/user/tray_user.cc
@@ -245,8 +245,7 @@ void TrayUser::UpdateAvatarImage(LoginStatus status) {
   const mojom::UserSession* const user_session =
       session_controller->GetUserSession(user_index_);
   CHECK(user_session);
-  // TODO(xiyuan); HiDpi avatar support. http://crbug.com/702689
-  avatar_->SetImage(gfx::ImageSkia::CreateFrom1xBitmap(user_session->avatar),
+  avatar_->SetImage(user_session->avatar,
                     gfx::Size(kTrayItemSize, kTrayItemSize));
 
   // Unit tests might come here with no images for some users.