IDBObserver: Lifetime Management: Adding Observer

third_party/WebKit/Source/modules/indexeddb/IDBObserverChanges.h

 // 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.
 
 #ifndef IDBObserverChanges_h
 #define IDBObserverChanges_h
 
 #include "bindings/core/v8/ScriptValue.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "modules/indexeddb/IDBDatabase.h"
 #include "modules/indexeddb/IDBTransaction.h"
 #include "platform/heap/Handle.h"
 
 namespace blink {
 
 class ScriptState;
-class IDBDatabase;
-class IDBTransaction;
 class IDBObserverChangesRecord;
 
 class IDBObserverChanges final : public GarbageCollectedFinalized<IDBObserverChanges>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 
 public:
     static IDBObserverChanges* create(IDBDatabase*, IDBTransaction*, IDBAny*);
     virtual ~IDBObserverChanges();
 
     DECLARE_TRACE();
 
     // Implement IDL
     IDBTransaction* transaction() const { return m_transaction.get(); }
     IDBDatabase* database() const { return m_database.get(); }
     ScriptValue records(ScriptState*);
 
 private:
     IDBObserverChanges(IDBDatabase*, IDBTransaction*, IDBAny*);
 
     Member<IDBDatabase> m_database;
     Member<IDBTransaction> m_transaction;
     // TODO(palakj) : change to appropriate type Map<String, sequence<IDBObserverChangesRecord>>.
     Member<IDBAny> m_records;
 };
 
 } // namespace blink
 
 #endif // IDBObserverChanges_h