Partial revert of Provide WebContents::CreateParams to tab helpers.

https://chromium-review.googlesource.com/c/571285

atom/browser/api/atom_api_web_contents.cc

@@ -507,8 +507,7 @@ void WebContents::WebContentsCreated(
     int opener_render_frame_id,
     const std::string& frame_name,
     const GURL& target_url,
-    content::WebContents* new_contents,
-    const base::Optional<content::WebContents::CreateParams>& create_params) {
+    content::WebContents* new_contents) {
   v8::Locker locker(isolate());
   v8::HandleScope handle_scope(isolate());
   auto api_web_contents = CreateFrom(isolate(), new_contents, BROWSER_WINDOW);

atom/browser/api/atom_api_web_contents.h

@@ -254,8 +254,7 @@ class WebContents : public mate::TrackableObject<WebContents>,
       int opener_render_frame_id,
       const std::string& frame_name,
       const GURL& target_url,
-      content::WebContents* new_contents,
-      const base::Optional<content::WebContents::CreateParams>& create_params)
+      content::WebContents* new_contents)
       override;
   void AddNewContents(content::WebContents* source,
                       content::WebContents* new_contents,