Disable direct routing of mouse events for RenderWidgetHostViewGuest

content/browser/frame_host/render_widget_host_view_guest.cc

Index: content/browser/frame_host/render_widget_host_view_guest.cc
diff --git a/content/browser/frame_host/render_widget_host_view_guest.cc b/content/browser/frame_host/render_widget_host_view_guest.cc
index 2ba2f0f35e979a557f8b7d7001118bd314d6101f..7df2cdac2f214537f3e7a282e64bdb968f2f553f 100644
--- a/content/browser/frame_host/render_widget_host_view_guest.cc
+++ b/content/browser/frame_host/render_widget_host_view_guest.cc
@@ -584,6 +584,10 @@ void RenderWidgetHostViewGuest::GestureEventAck(
     guest_->ResendEventToEmbedder(event);
 }
 
+bool RenderWidgetHostViewGuest::IsRenderWidgetHostViewGuest() {
+  return true;
+}
+
 void RenderWidgetHostViewGuest::OnHandleInputEvent(
     RenderWidgetHostImpl* embedder,
     int browser_plugin_instance_id,