Remove raw base::DictionaryValue::SetWithoutPathExpansion in //chrome

chrome/browser/ui/webui/chromeos/login/base_webui_handler.cc

Index: chrome/browser/ui/webui/chromeos/login/base_webui_handler.cc
diff --git a/chrome/browser/ui/webui/chromeos/login/base_webui_handler.cc b/chrome/browser/ui/webui/chromeos/login/base_webui_handler.cc
index 3bae474ca267dbc62251c524b32294e20a277cd8..aca69389faf6097b6523321f7066bbb1f81fadf5 100644
--- a/chrome/browser/ui/webui/chromeos/login/base_webui_handler.cc
+++ b/chrome/browser/ui/webui/chromeos/login/base_webui_handler.cc
@@ -78,8 +78,10 @@ void BaseWebUIHandler::ShowScreenWithData(OobeScreen screen,
     return;
   base::DictionaryValue screen_params;
   screen_params.SetString("id", GetOobeScreenName(screen));
-  if (data)
-    screen_params.SetWithoutPathExpansion("data", data->DeepCopy());
+  if (data) {
+    screen_params.SetWithoutPathExpansion("data",
+                                          base::MakeUnique<base::Value>(*data));
+  }
   web_ui()->CallJavascriptFunctionUnsafe("cr.ui.Oobe.showScreen",
                                          screen_params);
 }