Revert "Push API: define push event on Service Worker."

Source/modules/push_messaging/ServiceWorkerGlobalScopePush.h

Index: Source/modules/push_messaging/ServiceWorkerGlobalScopePush.h
diff --git a/Source/modules/push_messaging/ServiceWorkerGlobalScopePush.h b/Source/modules/push_messaging/ServiceWorkerGlobalScopePush.h
deleted file mode 100644
index 4c92682f076c75a84643c1a8470b539e1681f33e..0000000000000000000000000000000000000000
--- a/Source/modules/push_messaging/ServiceWorkerGlobalScopePush.h
+++ /dev/null
@@ -1,19 +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.
-
-#ifndef ServiceWorkerGlobalScopePush_h
-#define ServiceWorkerGlobalScopePush_h
-
-#include "core/events/EventTarget.h"
-
-namespace WebCore {
-
-class ServiceWorkerGlobalScopePush {
-public:
-    DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(push);
-};
-
-} // namespace WebCore
-
-#endif // ServiceWorkerGlobalScopePush_h