Remove unnecessary finalization of IDBObserver classes.

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

Index: third_party/WebKit/Source/modules/indexeddb/IDBObserver.h
diff --git a/third_party/WebKit/Source/modules/indexeddb/IDBObserver.h b/third_party/WebKit/Source/modules/indexeddb/IDBObserver.h
index c8ef7daf516a55ccfef0c3b78f2726e60d78cf03..1b92e80bfbc2eae4bfb9cf61380700f429ce7728 100644
--- a/third_party/WebKit/Source/modules/indexeddb/IDBObserver.h
+++ b/third_party/WebKit/Source/modules/indexeddb/IDBObserver.h
@@ -21,14 +21,12 @@ class IDBObserverInit;
 class IDBTransaction;
 struct WebIDBObservation;
 
-class MODULES_EXPORT IDBObserver final : public GarbageCollectedFinalized<IDBObserver>, public ScriptWrappable {
+class MODULES_EXPORT IDBObserver final : public GarbageCollected<IDBObserver>, public ScriptWrappable {
     DEFINE_WRAPPERTYPEINFO();
 
 public:
     static IDBObserver* create(IDBObserverCallback&, const IDBObserverInit&);
 
-    ~IDBObserver();
-
     void removeObserver(int32_t id);
     void onChange(int32_t id, const WebVector<WebIDBObservation>&, const WebVector<int32_t>& observationIndex);