Replace hand-written IDBObserverCallback with auto-generated code

third_party/WebKit/Source/bindings/modules/v8/V8IDBObserverCallback.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 V8IDBObserverCallback_h
-#define V8IDBObserverCallback_h
-
-#include "bindings/core/v8/ActiveDOMCallback.h"
-#include "bindings/core/v8/DOMWrapperWorld.h"
-#include "bindings/core/v8/ScopedPersistent.h"
-#include "modules/indexeddb/IDBObserverCallback.h"
-
-namespace blink {
-
-class V8IDBObserverCallback final : public IDBObserverCallback,
-                                    public ActiveDOMCallback {
-  USING_GARBAGE_COLLECTED_MIXIN(V8IDBObserverCallback);
-
- public:
-  V8IDBObserverCallback(v8::Local<v8::Function>,
-                        v8::Local<v8::Object>,
-                        ScriptState*);
-  ~V8IDBObserverCallback() override;
-
-  DECLARE_VIRTUAL_TRACE();
-
-  void handleChanges(IDBObserverChanges&, IDBObserver&) override;
-  ExecutionContext* getExecutionContext() const override {
-    return ContextLifecycleObserver::getExecutionContext();
-  }
-
- private:
-  ScopedPersistent<v8::Function> m_callback;
-  RefPtr<ScriptState> m_scriptState;
-};
-
-}  // namespace blink
-#endif  // V8IDBObserverCallback_h