Revert "UMA: How often are different network error screens encountered during OOBE"

chrome/browser/chromeos/login/error_screens_histogram_helper.h

-// Copyright 2014 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_LOGIN_ERROR_SCREENS_HISTOGRAM_HELPER_H_
-#define CHROME_BROWSER_CHROMEOS_LOGIN_ERROR_SCREENS_HISTOGRAM_HELPER_H_
-
-#include "chrome/browser/chromeos/login/screens/error_screen.h"
-
-namespace chromeos {
-FORWARD_DECLARE_TEST(ErrorScreensHistogramHelperTest, TestShowHideTime);
-FORWARD_DECLARE_TEST(ErrorScreensHistogramHelperTest, TestShowHideShowHideTime);
-FORWARD_DECLARE_TEST(ErrorScreensHistogramHelperTest, TestShowShowHideTime);
-
-class ErrorScreensHistogramHelper {
- public:
-  explicit ErrorScreensHistogramHelper(const std::string& screen_name);
-  void OnScreenShow();
-  void OnErrorShow(ErrorScreen::ErrorState error);
-  void OnErrorHide();
-  ~ErrorScreensHistogramHelper();
-
- private:
-  FRIEND_TEST_ALL_PREFIXES(ErrorScreensHistogramHelperTest, TestShowHideTime);
-  FRIEND_TEST_ALL_PREFIXES(ErrorScreensHistogramHelperTest,
-                           TestShowHideShowHideTime);
-  FRIEND_TEST_ALL_PREFIXES(ErrorScreensHistogramHelperTest,
-                           TestShowShowHideTime);
-  // functions for testing.
-  void OnErrorShowTime(ErrorScreen::ErrorState error, base::Time now);
-  void OnErrorHideTime(base::Time now);
-
-  std::string screen_name_;
-  bool was_shown_;
-  ErrorScreen::ErrorState last_error_shown_;
-  base::Time error_screen_start_time;
-  base::TimeDelta time_on_error_screens;
-};
-
-}  // namespace chromeos
-
-#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_ERROR_SCREENS_HISTOGRAM_HELPER_H_