Push API: rename registration to subscription.

Source/modules/push_messaging/PushRegistration.h

Index: Source/modules/push_messaging/PushRegistration.h
diff --git a/Source/modules/push_messaging/PushRegistration.h b/Source/modules/push_messaging/PushRegistration.h
deleted file mode 100644
index 48551c188ac8ee2bfe181b15480e956dc444ea64..0000000000000000000000000000000000000000
--- a/Source/modules/push_messaging/PushRegistration.h
+++ /dev/null
@@ -1,44 +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 PushRegistration_h
-#define PushRegistration_h
-
-#include "bindings/core/v8/ScriptPromise.h"
-#include "bindings/core/v8/ScriptWrappable.h"
-#include "platform/heap/Handle.h"
-#include "wtf/text/WTFString.h"
-
-namespace blink {
-
-class ServiceWorkerRegistration;
-class ScriptPromiseResolver;
-class ScriptState;
-struct WebPushRegistration;
-
-class PushRegistration final : public GarbageCollectedFinalized<PushRegistration>, public ScriptWrappable {
-    DEFINE_WRAPPERTYPEINFO();
-public:
-    static PushRegistration* take(ScriptPromiseResolver*, WebPushRegistration*, ServiceWorkerRegistration*);
-    static void dispose(WebPushRegistration* registrationRaw);
-
-    virtual ~PushRegistration();
-
-    const String& endpoint() const { return m_endpoint; }
-    const String& registrationId() const { return m_registrationId; }
-    ScriptPromise unregister(ScriptState*);
-
-    void trace(Visitor*);
-
-private:
-    PushRegistration(const String& endpoint, const String& registrationId, ServiceWorkerRegistration*);
-
-    String m_endpoint;
-    String m_registrationId;
-    Member<ServiceWorkerRegistration> m_serviceWorkerRegistration;
-};
-
-} // namespace blink
-
-#endif // PushRegistration_h