Enable builtin Mojo JS modules in layout tests

content/public/browser/web_ui_data_source.h

Index: content/public/browser/web_ui_data_source.h
diff --git a/content/public/browser/web_ui_data_source.h b/content/public/browser/web_ui_data_source.h
index 2966da39d2202c37f7ab7f8985c7581dedbecf8d..3b174c443f84bcc70d496dda661d9dd1e13d201e 100644
--- a/content/public/browser/web_ui_data_source.h
+++ b/content/public/browser/web_ui_data_source.h
@@ -72,9 +72,6 @@ class WebUIDataSource {
   // Allows a caller to add a filter for URL requests.
   virtual void SetRequestFilter(const HandleRequestCallback& callback) = 0;
 
-  // Adds the necessary resources for mojo bindings.
-  virtual void AddMojoResources() = 0;
-
   // The following map to methods on URLDataSource. See the documentation there.
   // NOTE: it's not acceptable to call DisableContentSecurityPolicy for new
   // pages, see URLDataSource::ShouldAddContentSecurityPolicy and talk to