Fix X11DesktopHandler::ActivateWindow on Unity for known user gestures

ui/views/widget/native_widget_aura.cc

Index: ui/views/widget/native_widget_aura.cc
diff --git a/ui/views/widget/native_widget_aura.cc b/ui/views/widget/native_widget_aura.cc
index bf113e6e119de7bcb3ab99b2f21a1d185eba9ef7..851f73bb6e068cd713d5f62b93f3dc50d8804c50 100644
--- a/ui/views/widget/native_widget_aura.cc
+++ b/ui/views/widget/native_widget_aura.cc
@@ -515,6 +515,10 @@ void NativeWidgetAura::Activate() {
     window_->SetProperty(aura::client::kDrawAttentionKey, false);
 }
 
+void NativeWidgetAura::ActivateForUserGesture() {
+  Activate();
+}
+
 void NativeWidgetAura::Deactivate() {
   if (!window_)
     return;