Fix interstitials on OOPIF-based guests.

content/browser/frame_host/render_widget_host_view_child_frame.cc

Index: content/browser/frame_host/render_widget_host_view_child_frame.cc
diff --git a/content/browser/frame_host/render_widget_host_view_child_frame.cc b/content/browser/frame_host/render_widget_host_view_child_frame.cc
index c895564f5d41f4b9f5d8e991389caca3768c5101..93bec73cfb755095fc75977a013f0e5453bdbf79 100644
--- a/content/browser/frame_host/render_widget_host_view_child_frame.cc
+++ b/content/browser/frame_host/render_widget_host_view_child_frame.cc
@@ -85,6 +85,7 @@ void RenderWidgetHostViewChildFrame::SetCrossProcessFrameConnector(
                                                         frame_sink_id_);
     }
     parent_frame_sink_id_ = cc::FrameSinkId();
+    local_surface_id_ = cc::LocalSurfaceId();
 
     // Unlocks the mouse if this RenderWidgetHostView holds the lock.
     UnlockMouse();