Fix X11DesktopHandler::ActivateWindow on Unity for known user gestures

ui/base/base_window.cc

Index: ui/base/base_window.cc
diff --git a/ui/base/base_window.cc b/ui/base/base_window.cc
index 231a1771797ef9048144e4254f3a561c4ac3ea60..3b3b7a17409930abad30a5c7bf9f5bec5894fa65 100644
--- a/ui/base/base_window.cc
+++ b/ui/base/base_window.cc
@@ -12,5 +12,13 @@ bool BaseWindow::IsRestored(const BaseWindow& window) {
      !window.IsFullscreen();
 }
 
+void BaseWindow::ShowForUserGesture() {
+  Show();
+}
+
+void BaseWindow::ActivateForUserGesture() {
+  Activate();
+}
+
 }  // namespace ui