Revert of ServiceWorker: Introduce SWMessageSender in order to mock IPC messaging

content/child/service_worker/service_worker_message_sender.h

Index: content/child/service_worker/service_worker_message_sender.h
diff --git a/content/child/service_worker/service_worker_message_sender.h b/content/child/service_worker/service_worker_message_sender.h
deleted file mode 100644
index e1732f2ea8c7cae22021f4451138a97ab2384f1f..0000000000000000000000000000000000000000
--- a/content/child/service_worker/service_worker_message_sender.h
+++ /dev/null
@@ -1,43 +0,0 @@
-// 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 CONTENT_CHILD_SERVICE_WORKER_SERVICE_WORKER_MESSAGE_SENDER_H_
-#define CONTENT_CHILD_SERVICE_WORKER_SERVICE_WORKER_MESSAGE_SENDER_H_
-
-#include "base/memory/ref_counted.h"
-#include "content/common/content_export.h"
-
-namespace IPC {
-class Message;
-}
-
-namespace content {
-
-class ThreadSafeSender;
-
-// A thin wrapper of ThreadSafeSender. Tests can inject a mock for IPC messaging
-// in this layer.
-class CONTENT_EXPORT ServiceWorkerMessageSender
-    : public base::RefCountedThreadSafe<ServiceWorkerMessageSender> {
- public:
-  explicit ServiceWorkerMessageSender(ThreadSafeSender* sender);
-
-  virtual bool Send(IPC::Message* message);
-
-  ThreadSafeSender* thread_safe_sender() { return thread_safe_sender_.get(); }
-
- protected:
-  virtual ~ServiceWorkerMessageSender();
-
- private:
-  friend class base::RefCountedThreadSafe<ServiceWorkerMessageSender>;
-
-  scoped_refptr<ThreadSafeSender> thread_safe_sender_;
-
-  DISALLOW_COPY_AND_ASSIGN(ServiceWorkerMessageSender);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_CHILD_SERVICE_WORKER_SERVICE_WORKER_MESSAGE_SENDER_H_