Reland Call dispatcher's releaseRegistration when done with registrations

Source/modules/background_sync/SyncRegistration.cpp

 // 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.
 
 #include "config.h"
 #include "modules/background_sync/SyncRegistration.h"
 
 #include "bindings/core/v8/CallbackPromiseAdapter.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/dom/DOMException.h"
@@ skipping 30 matching lines @@
 
 SyncRegistration::SyncRegistration(int64_t id, const SyncRegistrationOptions& options, ServiceWorkerRegistration* serviceWorkerRegistration)
     : m_id(id)
     , m_tag(options.tag())
     , m_serviceWorkerRegistration(serviceWorkerRegistration)
 {
 }
 
 SyncRegistration::~SyncRegistration()
 {
+    Platform* currentPlatform = Platform::current();
+    if (!currentPlatform)
+        return;
+    WebSyncProvider* syncProvider = currentPlatform->backgroundSyncProvider();
+    if (!syncProvider)
+        return;
+    syncProvider->releaseRegistration(m_id);
 }
 
 ScriptPromise SyncRegistration::done(ScriptState* scriptState)
 {
     if (m_id == WebSyncRegistration::UNREGISTERED_SYNC_ID)
         return ScriptPromise::rejectWithDOMException(scriptState, DOMException::create(AbortError, "Operation failed - not a valid registration object"));
 
     ScriptPromiseResolver* resolver = ScriptPromiseResolver::create(scriptState);
     ScriptPromise promise = resolver->promise();
 
@@ skipping 20 matching lines @@
 
     return promise;
 }
 
 DEFINE_TRACE(SyncRegistration)
 {
     visitor->trace(m_serviceWorkerRegistration);
 }
 
 } // namespace blink