Enable builtin Mojo JS modules in layout tests

chrome/browser/ui/webui/engagement/site_engagement_ui.cc

 // Copyright 2015 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.
 
 #include "chrome/browser/ui/webui/engagement/site_engagement_ui.h"
 
 #include <utility>
 
 #include "base/macros.h"
 #include "chrome/browser/engagement/site_engagement_service.h"
@@ skipping 70 matching lines @@
   source->AddResourcePath("engagement_table.html",
                           IDR_SITE_ENGAGEMENT_ENGAGEMENT_TABLE_HTML);
   source->AddResourcePath("engagement_table.css",
                           IDR_SITE_ENGAGEMENT_ENGAGEMENT_TABLE_CSS);
   source->AddResourcePath("engagement_table.js",
                           IDR_SITE_ENGAGEMENT_ENGAGEMENT_TABLE_JS);
   source->AddResourcePath("site_engagement.js", IDR_SITE_ENGAGEMENT_JS);
   source->AddResourcePath(
       "chrome/browser/ui/webui/engagement/site_engagement.mojom",
       IDR_SITE_ENGAGEMENT_MOJO_JS);
-  source->AddMojoResources();
   source->SetDefaultResource(IDR_SITE_ENGAGEMENT_HTML);
 
   content::WebUIDataSource::Add(Profile::FromWebUI(web_ui), source.release());
 }
 
 SiteEngagementUI::~SiteEngagementUI() {}
 
 void SiteEngagementUI::BindUIHandler(
     mojo::InterfaceRequest<SiteEngagementUIHandler> request) {
   ui_handler_.reset(new SiteEngagementUIHandlerImpl(
       Profile::FromWebUI(web_ui()), std::move(request)));
 }