CryptAuth: Remove unused ConnectionFinder.

Bug: 899324
Test: none
Change-Id: I30f07136ac7c3ed3ac49b678e5f45d250fcbe65f
Reviewed-on: https://chromium-review.googlesource.com/c/1331573Reviewed-by: Jeremy Klein <jlklein@chromium.org>
Commit-Queue: James Hawkins <jhawkins@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607302}

components/cryptauth/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_CRYPTAUTH_CONNECTION_FINDER_H_
-#define COMPONENTS_CRYPTAUTH_CONNECTION_FINDER_H_
-
-#include <memory>
-
-#include "base/callback_forward.h"
-#include "base/macros.h"
-#include "components/cryptauth/connection.h"
-
-namespace cryptauth {
-
-// Interface for finding a connection to a remote device.
-class ConnectionFinder {
- public:
-  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(std::unique_ptr<Connection> connection)>
-      ConnectionCallback;
-  virtual void Find(const ConnectionCallback& connection_callback) = 0;
-};
-
-}  // namespace cryptauth
-
-#endif  // COMPONENTS_CRYPTAUTH_CONNECTION_FINDER_H_