Remove unnecessary finalization of IDBObserver classes.

third_party/WebKit/Source/modules/indexeddb/IDBObserver.cpp

 // Copyright 2016 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 "modules/indexeddb/IDBObserver.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/modules/v8/ToV8ForModules.h"
 #include "bindings/modules/v8/V8BindingForModules.h"
 #include "core/dom/ExceptionCode.h"
@@ skipping 20 matching lines @@
 {
     // TODO(palakj): Throw an exception if unknown operation type.
     DCHECK_EQ(m_operationTypes.size(), static_cast<size_t>(WebIDBOperationTypeCount));
     m_operationTypes.reset();
     m_operationTypes[WebIDBAdd] = options.operationTypes().contains(IndexedDBNames::add);
     m_operationTypes[WebIDBPut] = options.operationTypes().contains(IndexedDBNames::put);
     m_operationTypes[WebIDBDelete] = options.operationTypes().contains(IndexedDBNames::kDelete);
     m_operationTypes[WebIDBClear] = options.operationTypes().contains(IndexedDBNames::clear);
 }
 
-IDBObserver::~IDBObserver() {}
-
 void IDBObserver::observe(IDBDatabase* database, IDBTransaction* transaction, ExceptionState& exceptionState)
 {
     if (transaction->isFinished() || transaction->isFinishing()) {
         exceptionState.throwDOMException(TransactionInactiveError, IDBDatabase::transactionFinishedErrorMessage);
         return;
     }
     if (!transaction->isActive()) {
         exceptionState.throwDOMException(TransactionInactiveError, IDBDatabase::transactionInactiveErrorMessage);
         return;
     }
@@ skipping 39 matching lines @@
     m_callback->handleChanges(*IDBObserverChanges::create(it->value, observations, observationIndex), *this);
 }
 
 DEFINE_TRACE(IDBObserver)
 {
     visitor->trace(m_callback);
     visitor->trace(m_observerIds);
 }
 
 } // namespace blink