Revert of Add network throttling as an enterprise policy

chrome/browser/chromeos/net/network_throttling_observer.h

-// Copyright 2016 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_NET_NETWORK_THROTTLING_OBSERVER_H_
-#define CHROME_BROWSER_CHROMEOS_NET_NETWORK_THROTTLING_OBSERVER_H_
-
-#include <string>
-
-#include "base/memory/weak_ptr.h"
-#include "components/prefs/pref_change_registrar.h"
-
-class PrefRegistrySimple;
-class Profile;
-
-namespace chromeos {
-
-// NetworkThrottlingObserver is a singleton, owned by
-// ChromeBrowserMainPartsChromeos.
-// This class is responsible for propagating network bandwidth throttling policy
-// changes (prefs::kNetworkThrottlingEnabled) in Chrome down to Shill which
-// implements by calling 'tc' in the kernel.
-class NetworkThrottlingObserver {
- public:
-  explicit NetworkThrottlingObserver(PrefService* local_state);
-  ~NetworkThrottlingObserver();
-
-  static void RegisterPrefs(PrefRegistrySimple* registry);
-
- private:
-  // Callback used when prefs::kNetworkThrottlingEnabled changes
-  void OnPreferenceChanged(const std::string& pref_name);
-
-  PrefService* local_state_;
-  PrefChangeRegistrar pref_change_registrar_;
-
-  DISALLOW_COPY_AND_ASSIGN(NetworkThrottlingObserver);
-};
-
-}  // namespace chromeos
-
-#endif  // CHROME_BROWSER_CHROMEOS_NET_NETWORK_THROTTLING_OBSERVER_H_