[Easy Unlock] Port the BluetoothThrottler class to native code.

components/proximity_auth/bluetooth_connection_finder.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 COMPONENTS_PROXIMITY_AUTH_BLUETOOTH_CONNECTION_FINDER_H
 #define COMPONENTS_PROXIMITY_AUTH_BLUETOOTH_CONNECTION_FINDER_H
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
@@ skipping 46 matching lines @@
   void DelayedPollIfReady();
 
   // Unregisters |this| instance as an observer from all objects that it might
   // have registered with.
   void UnregisterAsObserver();
 
   // Callback to be called when the Bluetooth adapter is initialized.
   void OnAdapterInitialized(scoped_refptr<device::BluetoothAdapter> adapter);
 
   // ConnectionObserver:
-  void OnConnectionStatusChanged(const Connection& connection,
+  void OnConnectionStatusChanged(Connection* connection,
                                  Connection::Status old_status,
                                  Connection::Status new_status) override;
 
   // The remote device to connect to.
   const RemoteDevice remote_device_;
 
   // The UUID of the service on the remote device.
   const device::BluetoothUUID uuid_;
 
   // The time to wait between polling attempts.
@@ skipping 20 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(BluetoothConnectionFinder);
 };
 
 // TODO(isherman): Make sure to wire up the controller to listen for screen lock
 // state change events, and create or destroy the connection finder as
 // appropriate.
 
 }  // namespace proximity_auth
 
 #endif  // COMPONENTS_PROXIMITY_AUTH_BLUETOOTH_CONNECTION_FINDER_H