Delete geofencing implementation.

content/child/geofencing/geofencing_message_filter.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 CONTENT_CHILD_GEOFENCING_GEOFENCING_MESSAGE_FILTER_H_
-#define CONTENT_CHILD_GEOFENCING_GEOFENCING_MESSAGE_FILTER_H_
-
-#include "base/macros.h"
-#include "content/child/worker_thread_message_filter.h"
-
-namespace content {
-
-class GeofencingMessageFilter : public WorkerThreadMessageFilter {
- public:
-  explicit GeofencingMessageFilter(ThreadSafeSender* thread_safe_sender);
-
- private:
-  ~GeofencingMessageFilter() override;
-
-  // WorkerThreadMessageFilter:
-  bool ShouldHandleMessage(const IPC::Message& msg) const override;
-  void OnFilteredMessageReceived(const IPC::Message& msg) override;
-  bool GetWorkerThreadIdForMessage(const IPC::Message& msg,
-                                   int* ipc_thread_id) override;
-
-  DISALLOW_COPY_AND_ASSIGN(GeofencingMessageFilter);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_CHILD_GEOFENCING_GEOFENCING_MESSAGE_FILTER_H_