Fix X11DesktopHandler::ActivateWindow on Unity for known user gestures

ui/views/widget/widget.cc

Index: ui/views/widget/widget.cc
diff --git a/ui/views/widget/widget.cc b/ui/views/widget/widget.cc
index b4d2a484233ab797a8ba48fc2c6a00edde22ebd0..f8d6e3bfe62df60ee174ce51d064e3974e9528db 100644
--- a/ui/views/widget/widget.cc
+++ b/ui/views/widget/widget.cc
@@ -651,6 +651,10 @@ void Widget::Activate() {
   native_widget_->Activate();
 }
 
+void Widget::ActivateForUserGesture() {
+  native_widget_->ActivateForUserGesture();
+}
+
 void Widget::Deactivate() {
   native_widget_->Deactivate();
 }