diff --git a/atom/browser/web_view_guest_delegate.cc b/atom/browser/web_view_guest_delegate.cc
index 38f4da4c1f96..efa21421c0d6 100644
--- a/atom/browser/web_view_guest_delegate.cc
+++ b/atom/browser/web_view_guest_delegate.cc
@@ -158,7 +158,8 @@ void WebViewGuestDelegate::SetGuestHost(content::GuestHost* guest_host) {
 void WebViewGuestDelegate::WillAttach(
     content::WebContents* embedder_web_contents,
     int element_instance_id,
-    bool is_full_page_plugin) {
+    bool is_full_page_plugin,
+    const base::Closure& completion_callback) {
   embedder_web_contents_ = embedder_web_contents;
   is_full_page_plugin_ = is_full_page_plugin;
 }
diff --git a/atom/browser/web_view_guest_delegate.h b/atom/browser/web_view_guest_delegate.h
index 3312b46104a0..65e0bcde1916 100644
--- a/atom/browser/web_view_guest_delegate.h
+++ b/atom/browser/web_view_guest_delegate.h
@@ -70,7 +70,8 @@ class WebViewGuestDelegate : public content::BrowserPluginGuestDelegate,
   void SetGuestHost(content::GuestHost* guest_host) final;
   void WillAttach(content::WebContents* embedder_web_contents,
                   int element_instance_id,
-                  bool is_full_page_plugin) final;
+                  bool is_full_page_plugin,
+                  const base::Closure& completion_callback) final;
 
  private:
   // This method is invoked when the contents auto-resized to give the container