Simplify WebServiceWorker{Registration}Proxy interfaces.

Source/platform/exported/WebServiceWorkerProxy.cpp

Index: Source/platform/exported/WebServiceWorkerProxy.cpp
diff --git a/Source/platform/exported/WebServiceWorkerProxy.cpp b/Source/platform/exported/WebServiceWorkerProxy.cpp
deleted file mode 100644
index 62f25878ce5651bc6b7dade1ba4d01f3a24b9a3f..0000000000000000000000000000000000000000
--- a/Source/platform/exported/WebServiceWorkerProxy.cpp
+++ /dev/null
@@ -1,22 +0,0 @@
-// 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.
-
-#include "config.h"
-#include "public/platform/WebServiceWorkerProxy.h"
-
-namespace blink {
-
-class ServiceWorker;
-
-WebServiceWorkerProxy::WebServiceWorkerProxy(ServiceWorker* serviceWorker)
-    : m_private(serviceWorker)
-{
-}
-
-ServiceWorker* WebServiceWorkerProxy::unwrap() const
-{
-    return m_private;
-}
-
-} // namespace blink