Revert of Reland Call dispatcher's releaseRegistration when done with registrations

Source/modules/background_sync/PeriodicSyncRegistration.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/PeriodicSyncRegistration.h"
 
 #include "bindings/core/v8/CallbackPromiseAdapter.h"
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "core/dom/DOMException.h"
@@ skipping 48 matching lines @@
     , m_minPeriod(options.minPeriod())
     , m_networkState(options.networkState())
     , m_powerState(options.powerState())
     , m_tag(options.tag())
     , m_serviceWorkerRegistration(serviceWorkerRegistration)
 {
 }
 
 PeriodicSyncRegistration::~PeriodicSyncRegistration()
 {
-    Platform* currentPlatform = Platform::current();
-    if (!currentPlatform)
-        return;
-    WebSyncProvider* syncProvider = currentPlatform->backgroundSyncProvider();
-    if (!syncProvider)
-        return;
-    syncProvider->releaseRegistration(m_id);
 }
 
 ScriptPromise PeriodicSyncRegistration::unregister(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();
 
     WebSyncProvider* webSyncProvider = Platform::current()->backgroundSyncProvider();
     ASSERT(webSyncProvider);
 
     webSyncProvider->unregisterBackgroundSync(WebSyncRegistration::PeriodicityPeriodic, m_id, m_tag, m_serviceWorkerRegistration->webRegistration(), new SyncUnregistrationCallbacks(resolver, m_serviceWorkerRegistration));
 
     return promise;
 }
 
 DEFINE_TRACE(PeriodicSyncRegistration)
 {
     visitor->trace(m_serviceWorkerRegistration);
 }
 
 } // namespace blink