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

content/browser/renderer_host/render_message_filter.cc

Index: content/browser/renderer_host/render_message_filter.cc
diff --git a/content/browser/renderer_host/render_message_filter.cc b/content/browser/renderer_host/render_message_filter.cc
index 0684b0ffe77e6c5e71c9089403cfcb020a1b142e..e6d02dbfb6ec042c0d25499853bb6b2046b2861a 100644
--- a/content/browser/renderer_host/render_message_filter.cc
+++ b/content/browser/renderer_host/render_message_filter.cc
@@ -402,10 +402,13 @@ void RenderMessageFilter::OnMsgCreateWindow(
     int* route_id,
     int* surface_id,
     int64* cloned_session_storage_namespace_id) {
-  if (!content::GetContentClient()->browser()->CanCreateWindow(
+  content::ContentBrowserClient::CanCreateWindowResult result =
+      content::GetContentClient()->browser()->CanCreateWindow(
           GURL(params.opener_url), GURL(params.opener_security_origin),
           params.window_container_type, resource_context_,
-          render_process_id_)) {
+          render_process_id_);
+
+  if (result == content::ContentBrowserClient::CANNOT_CREATE_WINDOW) {
     *route_id = MSG_ROUTING_NONE;
     *surface_id = 0;
     return;
@@ -427,6 +430,7 @@ void RenderMessageFilter::OnMsgCreateWindow(
 #endif
 
   render_widget_helper_->CreateNewWindow(params,
+                                         result,
                                          peer_handle(),
                                          route_id,
                                          surface_id);