diff --git a/atom/browser/atom_browser_client.cc b/atom/browser/atom_browser_client.cc
index 3401ef58187e..61c97f2c35ce 100644
--- a/atom/browser/atom_browser_client.cc
+++ b/atom/browser/atom_browser_client.cc
@@ -100,14 +100,13 @@ bool AtomBrowserClient::ShouldCreateNewSiteInstance(
 
   int process_id = current_instance->GetProcess()->GetID();
   if (!IsRendererSandboxed(process_id)) {
-    auto web_contents =
-        content::WebContents::FromRenderFrameHost(render_frame_host);
-    if (!WebContentsPreferences::UsesNativeWindowOpen(web_contents)) {
+    if (!RendererUsesNativeWindowOpen(process_id)) {
       // non-sandboxed renderers without native window.open should always create
       // a new SiteInstance
       return true;
     }
-
+    auto web_contents =
+        content::WebContents::FromRenderFrameHost(render_frame_host);
     if (!ChildWebContentsTracker::IsChildWebContents(web_contents)) {
       // Root WebContents should always create new process to make sure
       // native addons are loaded correctly after reload / navigation.
@@ -115,17 +114,6 @@ bool AtomBrowserClient::ShouldCreateNewSiteInstance(
       //  reuse process to allow synchronous cross-window scripting.)
       return true;
     }
-
-    // In a non-sandboxed renderer with native window open we should
-    // reuse the same site to allow cross-window scripting.  We do
-    // not need to check urls / domains as native window open logic
-    // handles cross site scripting protection.
-    //
-    // NOTE: We know that nativeWindowOpen is enabled at this point
-    // because we check if it is NOT enabled above this point.  We
-    // will only reach this return if sandbox is disabled but
-    // nativeWindowOpen is enabled.
-    return false;
   }
 
   // Create new a SiteInstance if navigating to a different site.