Make it so that allow_js_access: false can be used with background pages created by window.open.

content/browser/mock_content_browser_client.cc

Index: content/browser/mock_content_browser_client.cc
diff --git a/content/browser/mock_content_browser_client.cc b/content/browser/mock_content_browser_client.cc
index 84567851685e44a1df5ccfaebf146711b808f69b..1ce2fcdc0d25df1c4343ec771ea03e9c39dadabf 100644
--- a/content/browser/mock_content_browser_client.cc
+++ b/content/browser/mock_content_browser_client.cc
@@ -248,7 +248,9 @@ bool MockContentBrowserClient::CanCreateWindow(
     const GURL& source_origin,
     WindowContainerType container_type,
     ResourceContext* context,
-    int render_process_id) {
+    int render_process_id,
+    bool* no_javascript_access) {
+  *no_javascript_access = false;
   return true;
 }