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

content/public/browser/web_contents_delegate.cc

Index: content/public/browser/web_contents_delegate.cc
diff --git a/content/public/browser/web_contents_delegate.cc b/content/public/browser/web_contents_delegate.cc
index ed5a1d93f9213440dc499072ea9637acbdf6bcde..f4c0bc970380e7bfbe1da845d6eaca8930494df5 100644
--- a/content/public/browser/web_contents_delegate.cc
+++ b/content/public/browser/web_contents_delegate.cc
@@ -122,7 +122,8 @@ bool WebContentsDelegate::ShouldCreateWebContents(
     WebContents* web_contents,
     int route_id,
     WindowContainerType window_container_type,
-    const string16& frame_name) {
+    const string16& frame_name,
+    const GURL& target_url) {
   return true;
 }