IDBObserver: Lifetime Management: Adding Observer

third_party/WebKit/Source/modules/indexeddb/IDBObserver.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 IDBObserver_h
 #define IDBObserver_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "modules/indexeddb/IDBDatabase.h"
 #include "modules/indexeddb/IDBTransaction.h"
 #include "platform/heap/Handle.h"
+#include "wtf/RefPtr.h"
 
 namespace blink {
 
 class IDBObserverCallback;
 class IDBObserverInit;
 
 class IDBObserver final : public GarbageCollectedFinalized<IDBObserver>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 
 public:
     static IDBObserver* create(IDBObserverCallback&, const IDBObserverInit&);
     ~IDBObserver();
     // API methods
     void observe(IDBDatabase*, IDBTransaction*, ExceptionState&);
+    void unobserve(IDBDatabase*, ExceptionState&);
 
     DECLARE_TRACE();
 
 private:
-    explicit IDBObserver(IDBObserverCallback&, const IDBObserverInit&);
+    IDBObserver(IDBObserverCallback&, const IDBObserverInit&);
 
     Member<IDBObserverCallback> m_callback;
     bool m_transaction;
     bool m_values;
     bool m_noRecords;
 };
 
 } // namespace blink
 
 #endif // IDBObserver_h