[CrOS Tether] Make BluetoothThrottler a singleton which can be easily shared between EasyUnlock and…

components/proximity_auth/remote_device_life_cycle_impl.h

 // Copyright 2015 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 COMPONENTS_PROXIMITY_AUTH_REMOTE_DEVICE_LIFE_CYCLE_IMPL_H
 #define COMPONENTS_PROXIMITY_AUTH_REMOTE_DEVICE_LIFE_CYCLE_IMPL_H
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 93 matching lines @@
   // Authenticates the remote device after it is connected. Used in the
   // AUTHENTICATING state.
   std::unique_ptr<cryptauth::Authenticator> authenticator_;
 
   // Used in the FINDING_CONNECTION state to establish a connection to the
   // remote device.
   std::unique_ptr<cryptauth::ConnectionFinder> connection_finder_;
 
   // Rate limits Bluetooth connections to the same device. Used to in the
   // created cryptauth::ConnectionFinder.
-  std::unique_ptr<cryptauth::BluetoothThrottler> bluetooth_throttler_;
+  cryptauth::BluetoothThrottler* bluetooth_throttler_;
 
   // After authentication fails, this timer waits for a period of time before
   // retrying the connection.
   base::OneShotTimer authentication_recovery_timer_;
 
   base::WeakPtrFactory<RemoteDeviceLifeCycleImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RemoteDeviceLifeCycleImpl);
 };
 
 }  // namespace proximity_auth
 
 #endif  // COMPONENTS_PROXIMITY_AUTH_REMOTE_DEVICE_LIFE_CYCLE_IMPL_H