Move UserActivityDetector to ui/base/user_activity/.

ash/system/chromeos/power/power_event_observer.cc

Index: ash/system/chromeos/power/power_event_observer.cc
diff --git a/ash/system/chromeos/power/power_event_observer.cc b/ash/system/chromeos/power/power_event_observer.cc
index 610094df7a559c847c7afb4f0848c2c52266c224..65567f4ed0212ae97e70810a73ca2cb144506225 100644
--- a/ash/system/chromeos/power/power_event_observer.cc
+++ b/ash/system/chromeos/power/power_event_observer.cc
@@ -10,8 +10,8 @@
 #include "ash/wm/power_button_controller.h"
 #include "base/prefs/pref_service.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
+#include "ui/base/user_activity/user_activity_detector.h"
 #include "ui/display/chromeos/display_configurator.h"
-#include "ui/wm/core/user_activity_detector.h"
 
 namespace ash {
 
@@ -50,7 +50,7 @@ void PowerEventObserver::SuspendImminent() {
         RequestLockScreen();
   }
 
-  wm::UserActivityDetector::Get()->OnDisplayPowerChanging();
+  ui::UserActivityDetector::Get()->OnDisplayPowerChanging();
   shell->display_configurator()->SuspendDisplays();
 }