Revert of [Easy Unlock] Port the BluetoothConnectionFinder class to native code.

components/proximity_auth/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_CONNECTION_FINDER_H
-#define COMPONENTS_PROXIMITY_AUTH_CONNECTION_FINDER_H
-
-#include "base/callback_forward.h"
-#include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
-
-namespace proximity_auth {
-
-class Connection;
-
-// Interface for finding a connection to a remote device.
-class ConnectionFinder {
- public:
-  ConnectionFinder() {}
-  virtual ~ConnectionFinder() {}
-
-  // Attempts to find a connection to a remote device. The finder will try to
-  // find the connection indefinitely until the finder is destroyed. Calls
-  // |connection_callback| with the open connection once the remote device is
-  // connected.
-  // TODO(isherman): Can this just be done as part of the constructor?
-  typedef base::Callback<void(scoped_ptr<Connection> connection)>
-      ConnectionCallback;
-  virtual void Find(const ConnectionCallback& connection_callback) = 0;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(ConnectionFinder);
-};
-
-}  // namespace proximity_auth
-
-#endif  // COMPONENTS_PROXIMITY_AUTH_CONNECTION_FINDER_H