Move UserActivityDetector from ash/wm/ to ui/wm/core/.

chrome/browser/chromeos/kiosk_mode/kiosk_mode_screensaver.cc

Index: chrome/browser/chromeos/kiosk_mode/kiosk_mode_screensaver.cc
diff --git a/chrome/browser/chromeos/kiosk_mode/kiosk_mode_screensaver.cc b/chrome/browser/chromeos/kiosk_mode/kiosk_mode_screensaver.cc
index ed7f799e65c149baefc152b8095f325ceef88648..27c90bd9b1ebcb6ca7bffb1aaf22ae65ca44553d 100644
--- a/chrome/browser/chromeos/kiosk_mode/kiosk_mode_screensaver.cc
+++ b/chrome/browser/chromeos/kiosk_mode/kiosk_mode_screensaver.cc
@@ -6,7 +6,6 @@
 
 #include "ash/screensaver/screensaver_view.h"
 #include "ash/shell.h"
-#include "ash/wm/user_activity_detector.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/lazy_instance.h"
@@ -29,6 +28,7 @@
 #include "content/public/browser/notification_service.h"
 #include "extensions/browser/extension_system.h"
 #include "extensions/common/extension.h"
+#include "ui/wm/core/user_activity_detector.h"
 
 using extensions::Extension;
 using extensions::SandboxedUnpacker;