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 0e24df06f853bcbf81c2763e5bf1ddc6559f9e94..72429a69aed85e9171aa280b0b784658487e6a4d 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;
 }