Handle _NET_ACTIVE_WINDOW or FocusIn & FocusOut, not both.

ui/views/widget/desktop_aura/x11_desktop_handler.cc

Index: ui/views/widget/desktop_aura/x11_desktop_handler.cc
diff --git a/ui/views/widget/desktop_aura/x11_desktop_handler.cc b/ui/views/widget/desktop_aura/x11_desktop_handler.cc
index d32192b27be50aa19c72d7ca84314481a5f4435b..2ffd324809e0c2cdf79f893709b8cc223ebce3cf 100644
--- a/ui/views/widget/desktop_aura/x11_desktop_handler.cc
+++ b/ui/views/widget/desktop_aura/x11_desktop_handler.cc
@@ -134,11 +134,13 @@ bool X11DesktopHandler::IsActiveWindow(::Window window) const {
 void X11DesktopHandler::ProcessXEvent(XEvent* event) {
   switch (event->type) {
     case FocusIn:
-      if (current_window_ != event->xfocus.window)
+      if (!wm_supports_active_window_ &&
+          current_window_ != event->xfocus.window)
         OnActiveWindowChanged(event->xfocus.window, ACTIVE);
       break;
     case FocusOut:
-      if (current_window_ == event->xfocus.window)
+      if (!wm_supports_active_window_ &&
+          current_window_ == event->xfocus.window)
         OnActiveWindowChanged(None, NOT_ACTIVE);
       break;
     default: