Remove metrics collection from Kiosk Mode.

chrome/browser/chromeos/kiosk_mode/kiosk_mode_metrics.h

-// 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.
-
-#ifndef CHROME_BROWSER_CHROMEOS_KIOSK_MODE_KIOSK_MODE_METRICS_H_
-#define CHROME_BROWSER_CHROMEOS_KIOSK_MODE_KIOSK_MODE_METRICS_H_
-
-#include "base/time.h"
-
-namespace chromeos {
-
-// This class gathers metrics for Kiosk Mode.
-class KioskModeMetrics {
- public:
-  static KioskModeMetrics* Get();
-
-  // This method records that the demo user session was started.
-  void SessionStarted();
-
-  // This method records that the demo user session was ended.
-  void SessionEnded();
-
-  // This method records that the user opened an app.
-  void UserOpenedApp();
-
- private:
-  KioskModeMetrics();
-  ~KioskModeMetrics();
-
-  base::Time session_started_;
-  size_t apps_opened_;
-
-  DISALLOW_COPY_AND_ASSIGN(KioskModeMetrics);
-};
-
-}  // namespace chromeos
-
-#endif  // CHROME_BROWSER_CHROMEOS_KIOSK_MODE_KIOSK_MODE_METRICS_H_