Send IndexedDB observations through IDBDatabaseCallbacks.

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/ScriptState.h"
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "modules/ModulesExport.h"
 #include "platform/heap/Handle.h"
 #include "public/platform/WebVector.h"
 #include "public/platform/modules/indexeddb/WebIDBTypes.h"
 
 namespace blink {
 
 class ExceptionState;
 class IDBDatabase;
 class IDBObserverCallback;
 class IDBObserverInit;
 class IDBTransaction;
-struct WebIDBObservation;
 
 class MODULES_EXPORT IDBObserver final : public GarbageCollected<IDBObserver>,
                                          public ScriptWrappable {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   static IDBObserver* create(IDBObserverCallback*);
 
-  void removeObserver(int32_t id);
-  void onChange(int32_t id,
-                const WebVector<WebIDBObservation>&,
-                const WebVector<int32_t>& observationIndex);
+  IDBObserverCallback* callback() { return m_callback; }
 
   // Implement the IDBObserver IDL.
   void observe(IDBDatabase*,
                IDBTransaction*,
                const IDBObserverInit&,
                ExceptionState&);
   void unobserve(IDBDatabase*, ExceptionState&);
 
   DECLARE_TRACE();
 
  private:
   explicit IDBObserver(IDBObserverCallback*);
 
   Member<IDBObserverCallback> m_callback;
   HeapHashMap<int32_t, WeakMember<IDBDatabase>> m_observerIds;
 };
 
 }  // namespace blink
 
 #endif  // IDBObserver_h