Service CreateNewWindow on the UI thread with a new mojo interface

content/browser/renderer_host/render_widget_helper.h

Index: content/browser/renderer_host/render_widget_helper.h
diff --git a/content/browser/renderer_host/render_widget_helper.h b/content/browser/renderer_host/render_widget_helper.h
index 3e46e2c12169b1755a62bdd9c911e402c740198a..0cecadccb1c7919b5fa3c1ca3ab0c10971bc2609 100644
--- a/content/browser/renderer_host/render_widget_helper.h
+++ b/content/browser/renderer_host/render_widget_helper.h
@@ -56,13 +56,6 @@ class RenderWidgetHelper
   void ResumeDeferredNavigation(const GlobalRequestID& request_id);
 
   // IO THREAD ONLY -----------------------------------------------------------
-
-  void CreateNewWindow(mojom::CreateNewWindowParamsPtr params,
-                       bool no_javascript_access,
-                       int32_t* render_view_route_id,
-                       int32_t* main_frame_route_id,
-                       int32_t* main_frame_widget_route_id,
-                       SessionStorageNamespace* session_storage_namespace);
   void CreateNewWidget(int opener_id,
                        blink::WebPopupType popup_type,
                        int* route_id);