Revert of [CrOS Tether] Add the notion of a tether DeviceState.

chromeos/components/tether/tether_device_state_manager.h

Index: chromeos/components/tether/tether_device_state_manager.h
diff --git a/chromeos/components/tether/tether_device_state_manager.h b/chromeos/components/tether/tether_device_state_manager.h
deleted file mode 100644
index 4f05e70c29c8abe644a5d2c436fc82a61eb2646f..0000000000000000000000000000000000000000
--- a/chromeos/components/tether/tether_device_state_manager.h
+++ /dev/null
@@ -1,48 +0,0 @@
-// Copyright 2017 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 CHROMEOS_COMPONENTS_TETHER_TETHER_DEVICE_STATE_MANAGER_H_
-#define CHROMEOS_COMPONENTS_TETHER_TETHER_DEVICE_STATE_MANAGER_H_
-
-#include "base/macros.h"
-#include "chromeos/network/network_state_handler.h"
-#include "chromeos/network/network_state_handler_observer.h"
-
-namespace chromeos {
-
-class NetworkStateHandler;
-
-namespace tether {
-
-// Manages the device state of tether networks. The tether state is:
-//   *TECHNOLOGY_PROHIBITED when tethering is disallowed by policy.
-//   *TECHNOLOGY_UNAVAILABLE when tethering is allowed by policy, but either
-//    the device has no Bluetooth capabilities or the logged-in user has no
-//    tether hosts associated with their account.
-//   *TECHNOLOGY_AVAILABLE when tethering is allowed by policy, the device has
-//    Bluetooth capabilities, the logged-in user has tether hosts associated
-//    with their account, but the Instant Tethering setting is disabled.
-//   *TECHNOLOGY_ENABLED when tethering is allowed by policy, the device has
-//    Bluetooth capabilities, the logged-in user has tether hosts associated
-//    with their account, and the Instant Tethering setting is enabled.
-// TODO(hansberry): Complete this class description when implemented.
-class TetherDeviceStateManager : public NetworkStateHandlerObserver {
- public:
-  explicit TetherDeviceStateManager(NetworkStateHandler* network_state_handler);
-  ~TetherDeviceStateManager() override;
-
-  // NetworkStateHandlerObserver:
-  void DeviceListChanged() override;
-
- private:
-  NetworkStateHandler* network_state_handler_;
-
-  DISALLOW_COPY_AND_ASSIGN(TetherDeviceStateManager);
-};
-
-}  // namespace tether
-
-}  // namespace chromeos
-
-#endif  // CHROMEOS_COMPONENTS_TETHER_TETHER_DEVICE_STATE_MANAGER_H_