Remove unused #include.

Bug: none
Tbr: stevenjb
Change-Id: Ia9fc42e0433fd57549cd6fc3c19223ea44ac7827
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1983511Reviewed-by: Peter Kasting <pkasting@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727734}

ash/system/message_center/notifier_settings_view.cc

@@ -48,7 +48,6 @@
 #include "ui/views/controls/image_view.h"
 #include "ui/views/controls/label.h"
 #include "ui/views/controls/link.h"
-#include "ui/views/controls/link_listener.h"
 #include "ui/views/controls/scroll_view.h"
 #include "ui/views/controls/scrollbar/overlay_scroll_bar.h"
 #include "ui/views/layout/box_layout.h"