Remove ConnectivityStateHelper

chrome/browser/chromeos/net/connectivity_state_helper_observer.h

-// Copyright (c) 2013 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_CONNECTIVITY_STATE_HELPER_OBSERVER_H_
-#define CHROME_BROWSER_CHROMEOS_NET_CONNECTIVITY_STATE_HELPER_OBSERVER_H_
-
-namespace chromeos {
-
-// A common observer interface used by the ConnectivityStateHelper object to
-// relay observing events received from the (older) NetworkLibrary or the (new)
-// NetworkStateHandler implementations.
-class ConnectivityStateHelperObserver {
- public:
-  // Called when there's a change on the connection manager.
-  virtual void NetworkManagerChanged() = 0;
-
-  // Called when the default network changes.
-  virtual void DefaultNetworkChanged() = 0;
-};
-
-}  // namespace chromeos
-
-#endif  // CHROME_BROWSER_CHROMEOS_NET_CONNECTIVITY_STATE_HELPER_OBSERVER_H_