chromeos: Remove dead power manager code.

chrome/browser/chromeos/power/user_activity_notifier.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/chromeos/power/user_activity_notifier.h"
 
 #include "ash/shell.h"
 #include "ash/wm/user_activity_detector.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "chromeos/dbus/power_manager_client.h"
@@ skipping 14 matching lines @@
 UserActivityNotifier::~UserActivityNotifier() {
   ash::Shell::GetInstance()->user_activity_detector()->RemoveObserver(this);
 }
 
 void UserActivityNotifier::OnUserActivity() {
   base::TimeTicks now = base::TimeTicks::Now();
   // InSeconds() truncates rather than rounding, so it's fine for this
   // comparison.
   if (last_notify_time_.is_null() ||
       (now - last_notify_time_).InSeconds() >= kNotifyIntervalSec) {
-    DBusThreadManager::Get()->GetPowerManagerClient()->NotifyUserActivity(now);
+    DBusThreadManager::Get()->GetPowerManagerClient()->NotifyUserActivity();
     last_notify_time_ = now;
   }
 }
 
 }  // namespace chromeos